A brilliant idea occurred to him to his research in the lab.A. while devotingB. while de

问题补充：

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

答案：

A. while devoting

B. while devoting himself

(答案→)C. while he was devoted

D. while devoted

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