______his phone number, I would have made a call to him.A、If I knewB、If I shoul

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问题 ______his phone number, I would have made a call to him.

选项 A、If I knew
B、If I should know
C、Had I known
D、Should I knew

答案 C

解析根据主句谓语would have made可判断，本题考查对过去的假设，因此从句须用had done结构。同时，在条件句中，如果助动词为had，should或were，则可以省略if并把助动词提前。故C)Had I known符合题意。

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