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The students _______ their homework carefully when the teacher walked into the classroom quietly.
A.doB.did
C.are doingD.were doing
D

试题分析:句意:学生们正在认真做作业,当老师安静地走进教室时。根据when the teacher walked into the classroom quietly当老师安静地走进教室时,可知学生们正在做某事,从句为一般过去时,主句为过去进行时,故选D.
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