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

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

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

试题答案

B