– What do you think of teaching Bob?-- I find it fun and challenging. It is a job you ar

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. that

B. which

C. when

D. where

答案：

A. that

B. which

C. when

(答案→)D. where

解析：考查定语从句。先行词为a job，从句中不缺少主语或宾语，缺少地点状语，所以用关系副词where 或in which，句意：鲍勃，你认为教学怎么样？我发现教学既有趣又富有挑战性。它是这样的一份工作，在这份工作中你要做一些严肃而又令人感兴趣的事情。所以选D。