问题描述：
no one in the department but tom and i knows that the director is going to resign.
no one in the department but tom and i knows that the director is going to resign.为什么know要加s?是遵循的什么原则?
no one in the department but tom and i knows that the director is going to resign.为什么know要加s?是遵循的什么原则?
问题解答：
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