Really, the only valid choices are A and C; remember that "that" is restrictive (what follows is key information narrowing down the noun before) and will not have a comma, and "which" is usually not restrictive and will have a comma. Lacking a comma in the non-underlined portion, you're best off choosing C.stormier wrote:Cold blooded animals, such as snakes, lizards, and salamanders, have developed a variety of mechanisms which keep body temperatures at a comfortable level.
A. which keep
B. to keep
C. that keep
D. which kept
E. in order to keep
This is a question from McGraw Hill's verbal practice workbook. I had made the same choice.Really, the only valid choices are A and C; remember that "that" is restrictive (what follows is key information narrowing down the noun before) and will not have a comma, and "which" is usually not restrictive and will have a comma. Lacking a comma in the non-underlined portion, you're best off choosing C.
The intention of the sentence is to convey that Cold blooded animals have developed XYZ(mechanisms)..stormier wrote:This is a question from McGraw Hill's verbal practice workbook. I had made the same choice.Really, the only valid choices are A and C; remember that "that" is restrictive (what follows is key information narrowing down the noun before) and will not have a comma, and "which" is usually not restrictive and will have a comma. Lacking a comma in the non-underlined portion, you're best off choosing C.
A and D are clearly losers.
Why have you discarded B and E ?
My reason to discard B and E was a change in the meaning of sentence. Both B and E make the sentence sound as though the animals deliberately developed those mechanisms - but now, I am not sure whether my reasoning is correct, or is a "sounds good to the ear".
According to OA, C is incorrect, because ....a variety of mechanisms.... is singular and should be followed by that keeps
