问题: 求助一道单选
--Jim! Did you have a good time at the party?
--Yes, but I really_________ , because I had lots of work to do.
A. needn't have B. mustn't
C. shouldn't have D. shouldn't
选哪个？
A对不对？ C和D有什么差别？
解答:
答案选C
这个题目考察情态动词+HAVE+DONE
我们由第一句Did you have a good time 我们可只是对过去情况的询问，所以应该用情态动词+have +done
should have done :过去本来应该做而没有做；should not have done:过去本不应该做而做了
need have done: 过去需要做而没做，need not have done: 过去不必做而做了
must have done: 表示对过去情况的肯定猜测，只能放在肯定句中
我们根据题意：but I had lots of work to do ,表明说话人觉得不应该去晚会。所以答案选C
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