27. The boy was busy doing his homework, only_____once in a while to look out of the window.A.stoppi

题目简介

27. The boy was busy doing his homework, only_____once in a while to look out of the window.A.stoppi

题目详情


27. The boy was busy doing his homework, only_____once in a while to look out of the window.
A.stoppingB.to stopC.stoppedD.having stopped
题型:单选题难度:偏易来源:不详

答案

A

更多内容推荐