My brother is always making good use of the time he can spare.A. whenB. in whichC. whileD

问题补充：

My brother is always making good use of the time he can spare.

A. when

B. in which

C. while

D. that

答案：

A. when

B. in which

C. while

(答案→)D. that

解析：考查定语从句。先行词是the time，指物用which或that，定语从句中的spare缺少宾语，故用that作宾语。故选D。