He was busy writing the exam paper , only ___once in a while

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
maoke521 1年前 已收到1个回答 举报

lmyhm2000 幼苗

共回答了16个问题采纳率:81.3% 举报

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。

1年前

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