题目

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：他忙着编故事，偶尔停下来吸只烟。此题容易错选A。但only to do 表结果，人、而根据题意可知，此处表伴随且stop 几乎与was busy 同时发生，故用B，而having stopped 表示此动作限于谓语动词发生，与题意明显不符。

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