—What do you think of teaching Bob?—I find it fun and challenging. It is a job you are d

问题补充：

—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

答案：

(答案→)A. where

B. which

C. when

D. that

解析：A 考察定语从句。本题定语从句的先行词是job，从句的结构是主谓宾结构，定语关系代词在从句中只能充当地点状语，故A正确。