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
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 |
答案：B