(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.

(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.

#30496

where

which

when

that

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