If only I (know) ______ the answer, I would have told you.had known本句是由if only引起

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问题 If only I (know) ______ the answer, I would have told you.

选项

答案 had known

解析本句是由if only引起的虚拟语气，表示的是过去的情况，因此要用过去完成时。

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IfonlyI(know)______theanswer,Iwouldhavetoldyou.hadknown本句是由ifonly引起