题文
When deeply absorbed in work, ______ he often was, he would forget all about eating and sleeping.
| 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 and sleeping.
| A．that |
| B．which |
| C．where |
| D．when |
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