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

試題分析：句意：如果我知道他在家，那個時候我就給他打電話了。對過去情況的虛擬，條件句中用過去完成時，主句用would/should/might/could + have + 過去分詞。虛擬條件句中有had，should，were時，可以將if去掉，然后把had，should，were提到主語前面，選A。
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