题目内容

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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