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

问题描述:

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.what is
选B
定语从句
先行词在从句中作主语,又是人,所以可以用who
又因为【] am】所以谓语动词用am