摘要： He was busy writing a story. only once in a while to smoke a cigarette. A.to stop B.stopping C.to have stopped D.having stopped 答案 B 解析 句意为:他在忙着写一个故事.只是偶尔停下来抽支烟.此处应为现在分词短语作伴随状语.表示与write伴随的动作.A项通常作目的状语和结果状语.

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