You should made it a rule to leave things you can find them again.A. whenB. whereC. then

问题补充：

You should made it a rule to leave things you can find them again.

A. when

B. where

C. then

D. there

答案：

A. when

(答案→)B. where

C. then

D. there

解析：此题考查地点状语从句。由题意“你应养成习惯，把东西放在能再找到的地方”。可知B项为正确答案。when引导时间状语从句，此处不合题意；then和there是副词，不能引导从句。