- 二一组卷

题型：语法填空（单句）题类：常考题难易度：普通

By the time the teacher got into the classroom, the students 1 (clean) the classroom.

【考点】

【答案】

【解析】

组卷次数：39次 +选题

举一反三

—For about two hours

—No, he by the time I got there.

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