题目内容

______ he was at home, I would have phoned him then.
A．Had I knownB．I had knownC．Would I knowD．I would know
A

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。
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