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.

C


解析:

while后主語(yǔ)及助動(dòng)詞不能省略，因?yàn)閮删渲髡Z(yǔ)不一致。如主語(yǔ)一致，則：Mr Baker thought of the idea for the new machine  (B / D)  to his invention recently.

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