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【题目】________ I walked into the classroomthe teacher had already started teaching.

A. By the time B. As soon as C. After D. Because

【答案】A

【解析】句意:当我走进教室时,老师已经开始讲课了。A. By the time等到时候为止;B. As soon as;C. After在……之后;D. Because因为。by the time 的时候引导的时间状语从句用一般过去时,主句用过去完成时。故答案选A。

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