The teacher didn’t begin the class ______ all the students_______.

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问题 The teacher didn’t begin the class ______ all the students_______.

选项 A、until, stopped to talk
B、before, stopped talking
C、while, stopped to talk
D、because, stopped talking

答案B

解析 根据句子意思,要停止的是talk这个动作,所以要用stop talking形式,排除[A]和[C];  [D]选项中 because不符合题意。
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