Question

----I passed the college entrance examination.
----Congratulations! You________.

1. A.
   could have studied hard
2. B.
   must have studied hard
3. C.
   should have studied hard
4. D.
   might have studied hard

Answer 1

B
试题分析：考查情态动词用法。could have done本可以做某事，实际上却未做；must have done一定做了某事；should have done本应该做某事，实际上却未做；might have done也许做了某事；句意：—我通过了高考。—祝贺你。你一定学习得非常认真吧！根据句意说明是对过去所发生的事情的有把握的肯定推测，故B正确。
考点：考查情态动词用法
点评：本题是高考必考考点，一定要牢记句型意思。must have done过去肯定做了某事。should have done 本应该做而实际未做。can’t have done 过去不可能做了某事；shouldn’t have done 本不应该做而实际做了。 need have done 本有必要做某事；needn’t have done 本没有必要做某事；注意没有 mustn’t have done的形式。