As a student of Senior Three he has very little free time he can spend developing his ow

问题补充：

As a student of Senior Three, he has very little free time he can spend developing his own interest.

A. when

B. in which

C. at which

D. that

答案：

A. when

B. in which

C. at which

(答案→)D. that

解析：考查定语从句。此处选用关系代词that作及物动词spend的宾语。