33．A brilliant idea occurred to him, ______ to his research in the lab．
| A．while devoting | B．while devoting himself |
| C．while he was devoted | D．while devoted |
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33．A brilliant idea occurred to him, ______ to his research in the lab．
| A．while devoting | B．while devoting himself |
| C．while he was devoted | D．while devoted |
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