题目内容
______ he was at home, I would have phoned him then.
A. Had I known B. I had known C. Would I know D. I would know
A
【解析】
试题分析:句意:如果我知道他在家,那个时候我就给他打电话了。对过去情况的虚拟,条件句中用过去完成时,主句用would/should/might/could + have + 过去分词。虚拟条件句中有had,should,were时,可以将if去掉,然后把had,should,were提到主语前面,选A。
考点:考查虚拟语气
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