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问题: 选什么? 为什么? 详细解释理由!

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

解答:

B
only to do表非必然的结果,例如:He rushed there, only to be told that he was late.
或者将AC理解成表目的,也不符合句意。
D表示后半句先于前半句发生,不符合事实。
选B,他忙于写小说,只是偶尔才停下来去吸烟。