2. 外语
  3. ________his phone number, I would have made a call to him.

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

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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项Had I known符合题意。
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