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Chicken Gizzard - Expert please reply

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by abhi0697 » Fri May 27, 2011 4:47 am
Because chickens lack teeth, they need another way to break apart the food they eat before reaching the stomach, and for this reason, chickens have a gizzard in which stones they swallow are used to grind their food.
A) before reaching the stomach, and for this reason, chickens have a gizzard in which stones they swallow are used to grind their food.
B) before it reaches the stomach, and for this reason, chickens have a gizzard in which stones they have swallowed is used to grind their food.
C) before it reaches the stomach, and for this reason, chickens have a gizzard in which stones they swallow are used to grind their food.
D) before reaching the stomach, and for this reason, chickens have a gizzard in which stones they have swallowed is used to grind their food.
E) before it reaches the stomach, and for this reason, chickens have a gizzard in which stones they have swallowed are used to grind their food.

Source: platinumgmat, OA: E

Pls explain difference between C and E, use of simple present vs. present perfect.
Last edited by abhi0697 on Fri May 27, 2011 5:15 am, edited 1 time in total.
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by HSPA » Fri May 27, 2011 4:50 am
IMO C

It is btw C and E and just took C > E..
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by sameerballani » Fri May 27, 2011 5:08 am
abhi0697 wrote:Because chickens lack teeth, they need another way to break apart the food they eat before reaching the stomach, and for this reason, chickens have a gizzard in which stones they swallow are used to grind their food.
A) before reaching the stomach, and for this reason, chickens have a gizzard in which stones they swallow are used to grind their food.
B) before it reaches the stomach, and for this reason, chickens have a gizzard in which stones they have swallowed is used to grind their food.
C) before it reaches the stomach, and for this reason, chickens have a gizzard in which stones they swallow are used to grind their food.
D) before reaching the stomach, and for this reason, chickens have a gizzard in which stones they have swallowed is used to grind their food.
E) before it reaches the stomach, and for this reason, chickens have a gizzard in which stones they have swallowed are used to grind their food.
IMO C
What's the correct answer and the source of this question?
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by abhi0697 » Fri May 27, 2011 5:33 am
The reason for E and not C is "The present tense verb swallow should be replaced with the present perfect verb have swallowed in order to indicate that the swallowing occurred before the use of the stones"
Not really convinced as MGMAT SC states that use present perfect for continued action or continued effect of completed action. But the explanation here suggests that occurrence time of two events are different.
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by mundasingh123 » Fri May 27, 2011 6:34 am
abhi0697 wrote:The reason for E and not C is "The present tense verb swallow should be replaced with the present perfect verb have swallowed in order to indicate that the swallowing occurred before the use of the stones"
Not really convinced as MGMAT SC states that use present perfect for continued action or continued effect of completed action. But the explanation here suggests that occurrence time of two events are different.
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by GMATGuruNY » Fri May 27, 2011 6:42 am
abhi0697 wrote:The reason for E and not C is "The present tense verb swallow should be replaced with the present perfect verb have swallowed in order to indicate that the swallowing occurred before the use of the stones"
Not really convinced as MGMAT SC states that use present perfect for continued action or continued effect of completed action. But the explanation here suggests that occurrence time of two events are different.
Before the gizzards can use the stones to grind the food (in the present), the chickens must have swallowed the stones (sometime in the past). The present perfect helps to convey the correct sequence of events.
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