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

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I,____your good friend,will try my best to help you out A.who is B.who am C.that is D.what is
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选B.
这题是考查定语从句主谓一致.因为先行词是I,所以用关系代词who,又因为I是和be动词am搭配(I am...),所以选B