He _____ you more help,even though he was very busy. A, might have given B. might give C.may have

问题描述:

He _____ you more help,even though he was very busy. A, might have given B. might give C.may have
答案A 为什呢?

A
这是虚拟语气的表达,由后面的句子来判断,是过去,所以要用情态动词+完成式.
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