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.
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.
















