The job is fun and challenging. It is a job you are doing something serious but interesti

问题补充：

The job is fun and challenging. It is a job you are doing something serious but interesting.

A. where

B. which

C. when

D. that

答案：

(答案→)A. where

B. which

C. when

D. that

解析：句中先行词是job，但从句中主宾俱全，关系词在从句中用作状语，可知定语从句中应填关系副词。而job不是指时间，所以不能用when. 故答案是A。