The idea for the new machine came to Mr．Baker ________ to hi

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．

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fanweiyan 幼苗

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答案C
while后主语及助动词不能省略,因为两句主语不一致.如主语一致,则：Mr Baker thought of the idea for the new machine (B / D) to his invention recently.

1年前

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