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

游客2024-07-17  15

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 havemade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和were,则可以省略if并把助动词提前。故C)Had Iknown符合题意。
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