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37.I,_____ your good friend,will try my best to help you out.A.who is B.who am C.that is D.what is这是非限制性宾语从句,还是主语从句?区别?

题目详情
37.I,_____ your good friend,will try my best to help you out.
A.who is B.who am
C.that is D.what is
这是非限制性宾语从句,还是主语从句?区别?
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答案和解析
A(I后有逗号表明是非限制性定语从句,不可以用that)