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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

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

I, ________ your good friend, will try my best to help you out.

[　　]

I, ________ your good friend, will try my best to help you out.

[　　]