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一道英语题(虚拟语气)Hebusyyesterday,orheyouwithyourexperiment.was,wouldhavehelped

题目详情
一道英语题(虚拟语气)
He ____ busy yesterday,or he ___ you with your experiment.
was,would have helped
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答案和解析
He __was__ busy yesterday,or he _would have helped __ you with your experiment.
前面的句子发生在过去,所以要用过去时态.后面是虚拟的,并没有发生,所以用would have done