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

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

选项

答案had known

解析如果我知道答案早就告诉你了。本句是由if only 引导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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大学英语三级B级

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