When solving the problem a second time, you’d better be more careful you made a mistake.
A. in case
B. where
C. in which
D. that
网友回答
A. in case
(答案→)B. where
C. in which
D. that
解析：句意：当你再次解决这个问题时，你一定要小心在你出现错误的地方。in case万一；这里是where引导的地点状语从句，所以不用in which来替换，它只有在定语从句中可以替换，这里没有先行词，不是定语从句。where在从句中作状语。根据句意故选B。