Mr.Brown, and not I,  ________ chosen to be the representative o

Mr.Brown, and not I,  ________ chosen to be the representative of the class.
A、is
B、am
C、are
D、have been
【正确答案】:A
【题目解析】:and not I 为插入语,be动词与主语Mr.Brown 保持一致,用is