He was busy writing a story，only once in a while to smoke a cigaretteA. to stopB. stoppi

发布时间：2020-08-17 14:13:50

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

网友回答

A. to stop
(答案→)B. stopping
C. to have stopped
D. having stopped
解析：stop的逻辑主语是he，表示主动关系。
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