–What do you think of teaching, Bob?
–I find it fun and challenging. It is a job you are doing something serious but interesting.
A. where
B. Which
C. When
D. that
网友回答
(答案→)A. where
B. Which
C. When
D. that
解析：考查定语从句的用法。定语从句主谓宾完整，说明应该填关系副词，先行词为a job，定语从句的意思是在这个工作中……，所以答案用where引导的定语从句。