来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/07/17 06:12:35
一道英语题（虚拟语气）
He ____ busy yesterday,or he ___ you with your experiment.
was,would have helped
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
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