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问题: 请问一道选择题? 谢谢!

I, ______ your good friend, will try my best to help you out.
A. who is B. who am C. that is D. which am

解答:

A是正确答案。
B和D都不对因为只有I能做am的主语,因此永远不能说who am 或which am。
C.that is 作为非限制性定语从句不可以形容人但事情事务是可以的:
THIS SITUATION, THAT IS VERY FAMILIAR TO EVERYONE BY NOW, WILL HAVE TO BE DEALT WITH PROMPTLY.