【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】句意：他忙于做試卷，只是偶爾停下來核對(duì)一下時(shí)間。He與stop構(gòu)成主動(dòng)關(guān)系，使用現(xiàn)在分詞的形式，故選B。

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