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

问题补充：

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

A. enter

B. to enter

C. entering

D. entered

答案：

A. enter

(答案→)B. to enter

C. entering

D. entered

解析：考查非谓语动词作目的状语。句意：我们班每个人为了进入好的大学都努力学习，做我们所能做的一切。不定式作目的状语，所以选B。