2. 外语
  3. If only she (know) ______ that her behavior was not welcome, she would have been more careful with her manners.

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

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问题 If only she (know) ______ that her behavior was not welcome, she would have been more careful with her manners.
选项
答案had known
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