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He was busy writing a story, only once in a while to smoke a cigarette. A.to sto

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He was busy writing a story, only once in a while to smoke a cigarette. A.to sto

He was busy writing a story, only _____once in a whileto smoke a cigarette.

A.to stop           B.stopping          C.to havestopped    D.havingstopped

 

试题答案

【答案】

B

【解析】

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