He is one of the boys on time.A. who isB. who wereC. who areD. that is

问题补充：

He is one of the boys on time.

A. who is

B. who were

C. who are

D. that is

答案：

A. who is

B. who were

(答案→)C. who are

D. that is

解析：这是一个定语从句，先行词是boys，所以从句用复数形式。