(2013·北京，26)—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
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(答案→)A. where
B. which
C. when
D. that
解析：考查关系代词的选用。where引导定语从句修饰job，where相当于in which(in the job)。句意：——我认为它有趣并且充满挑战。它是一项严肃而有趣的工作。