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问题: 虚拟语气

You _____ such a serious mistake if you had followed his advice.
A. may not make B. might not make
C. shouldn’t have made D. might not have made
选哪个,为啥? 另外,c,D 不是一样吗?是不是不能缩写?

解答:

选D,由虚拟语气可知要用have done,而据句意应为“可能不会”所以选D,而C表示“不应该”。