题目内容
20. The students were busy doing their homework, only once in a while to have a rest.
A. to stop B. stopping
C. to have stopped D. having stopped
20. B考査非谓语动词。句意:学生们忙于做他们的家庭作业,只是偶尔停下来休息一会儿。这里考査作状语, 表伴随状况。A项是干扰项,这里不是表示出乎意料的结果,所以不选,故选B。
练习册系列答案
相关题目