Question

We           last night, but we went to the party instead.

1. A.
   must have studied
2. B.
   might study
3. C.
   should have studied
4. D.
   would study

Answer 1

C
试题分析：考查should have done本该做…而没做，句意：我们昨晚本该学习的，但去参加聚会了。Must have done过去一定做了。选C。
考点：考查should have done
点评：考查情态动词+have done的用法：指过去情况对推测和虚拟，should have done本该做…而没做，shouldn’t have done本不该做…而做，Must have done过去一定做了might have done过去可能做了，等。