If only she (know) ______ that her behavior was not welcome, she would have been

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问题 If only she (know) ______ that her behavior was not welcome, she would have been more careful with it.

选项

答案 had known

解析此处空格所在的从句为虚拟语气的条件从句，表示与过去事实相反的假设，所以应该用其过去完成时。

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