–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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–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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