Thepupils_______doingtheirexercises

发布时间：2020-07-27 15:52:03

The pupils _______ doing their exercises in the classroom now by their teacher.A.have kept busyB.are busyC.are keeping busyD.are being kept busy

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D解析keep sb．doing sth. 表示“使某人忙于……”，其被动语态则为be kept busy doing sth. 题目意在强调学生目前正在“使……做作业，”故用现在进行时的被动态。
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