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?

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?