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
考查分詞做狀語。He與stop構成主動關系，使用現(xiàn)在分詞的形式。句意：他忙于做試卷，只是偶爾停下來核對一下時間。
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