I who your classmate will support you forever.A. am B. isC. areD. be

问题补充：

I, who, your classmate, will support you forever.

A. am

B. is

C. are

D. be

答案：

(答案→)A. am

B. is

C. are

D. be

解析：考查定语从句，先行词是I，定语从句的谓语动词应和I保持一致，所以选A。