Question

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

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

Answer 1

【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，到…时候为止；B. As soon as一…就；C. After在……之后；D. Because因为。by the time 当…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。