When deeply absorbed in work，________he often was，he would forget all about eating or sleeping. (2012·北京，26)
| A．that | B．which |
| C．where | D．when |
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When deeply absorbed in work，________he often was，he would forget all about eating or sleeping. (2012·北京，26)
| A．that | B．which |
| C．where | D．when |
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