______ he was at home, I would have phoned him then.A．Had I knownB．I had knownC．
题型：不详难度：来源：
______ 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 |
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答案
| 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。 |
举一反三
I to my cousin’s birthday party last night, but I was not available.| A．went | B．had gone | C．would go | D．would have gone |
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--The mistake_____, I had been more careful.
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