The students _______ their homework carefully when the teacher walked into the classroom quietly.A．doB．didC．are doingD．were doing-初中英语-n多题

◎ 题干

The students _______ their homework carefully when the teacher walked into the classroom quietly.

A．do	B．did
C．are doing	D．were doing

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◎ 解析

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◎ 知识点

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