—What are you going to do this summer vacation? —I’m going to start a club to help student

问题补充：

—What are you going to do this summer vacation?

—I’m going to start a club to help students not interested in schoolwork.

A. who is

B. that is

C. who are

D. which are

答案：

A. who is

B. that is

(答案→)C. who are

D. which are

解析：句意：这个暑假你要去做什么？——我打算开个俱乐部，来帮助那些对作业不感兴趣的学生。结合语境可知本句中先行词students为下文定语从句中的逻辑主语，指人，故引导词用who，本句中who指代的是复数名词students，故谓语动词用复数，选C。