If only I (know) ______ the answer, I would have told you.had known如果我知道答案早就告诉你了

游客2023-10-03  5

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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