问题: would have done,could have done,should have done,need have done,must have done的用法及区别
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解答:
would have done本来要做的事却因为什么事而耽搁没有做,could have done本来能够做的事却没做,should have done本来应该做的事却没做 ,need have done有必要做的事却没做,must have done一定做过某事
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