– 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
网友回答
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。