题目内容
【题目】_______ I walked into class, the teacher had started teaching already.
A.By the time
B.While
C.After
D.Because
【答案】A
【解析】考查连词辨析。by the time 当……时候;while当……时候(多用于进行时); after在……之后;because因为。句意:当我走进教室时,老师已经开始上课了。故选A。
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