Bob would have helped us yesterday.but he ____.
A.was busy B.is busy C.had been busy D.will be
为什么选A呀?这个动作发生在过去,应该用过去完成时呀?不是吗
人气：466 ℃ 时间：2019-08-20 19:54:31
解答
would have done是对过去时的虚拟,后面句子用过去时
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