He was busy writing the exam paper , only once in a while to check the time. A．to stopB．stoppingC．to have stoppedD．having stopped 题目和参考答案——青夏教育精英家教网—

题目内容

He was busy writing the exam paper , only ___once in a while to check the time.

A．to stop

B．stopping

C．to have stopped

D．having stopped

考查分词做状语。He与stop构成主动关系，使用现在分词的形式。句意：他忙于做试卷，只是偶尔停下来核对一下时间。

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