I _______ a Chinese, have made u

I _______ a Chinese, have made up my mind to devote myself to my motherland.
A、that is
B、who is
C、which is
D、who are
【正确答案】：B
【题目解析】：定语从句，先行词为I ，关系代词要使用who ，先行词为单数，因此be 动词用is 答案选B