问题补充：
The idea for the new machine came to Mr. Baker to his invention recently.
A. while devoting
B. while devoted
C. while he was devoted
D. while devoting himself.
答案：
A. while devoting
B. while devoted
(答案→)C. while he was devoted
D. while devoting himself.
解析：while后主语及助动词不能省略，因为两句主语不一致
Mr Baker thought of the idea for the new machine (B / D) to his invention recently.
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