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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
B
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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