【題目】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

【答案】B

【解析】考查分詞做狀語。He與stop構(gòu)成主動關(guān)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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