Question

Everyone in our class was working hard and doing what we could ____ a good college.

Everyone in our class was working hard and doing what we could _________ a good college.
A. enter B. to enter C. entering D. entered

Answer 1

答案应是B。
此句为省略句，即在 could 后省略了动词 do，若把句子补完整应为Everyone in our class was working hard and doing what we could do to enter a good college。即句中的不定式短语(to enter a good college)是用作目的状语的，而不是与情态动词(could)一起构成谓语。

Answer 2

选C to enter

do sth. to do 为了...去做

整句意思：班上每一个人都为了能进一所好的大学而努力学习以及尽可能做所有的事。