题目内容

He was busy writing a story , only _______ once in a while to smoke a cigarette.
A．to stopB．stoppingC．to have stoppedD．having stopped
B
考察分词作状语。现在分词表示意料之中的结构，不定式表示意料之外的结果。句意：他忙于写故事，只是偶尔的停下来抽支烟。故B正确。他太忙，所以偶尔停下来是正常的事情。
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