问题
选择题
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
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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
B