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

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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