Our teacher makes good use of any time he can spare.A. whichB. thatC. whenD. in which

问题补充：

Our teacher makes good use of any time he can spare.

A. which

B. that

C. when

D. in which

答案：

A. which

(答案→)B. that

C. when

D. in which

解析：考查定语从句关系词的选择。弄清楚先行词与spare的关系。