题目内容
We were talking loudly_____ the teacher came in.
| A．While | B．When | C．What | D．Why |
B
解析试题分析：句意：当老师进来的时候，我们正在大声的交谈。when和while的区别在于：while引导的时间状语从句多用进行时态，而when引导的时间状语从句多用一般时态。结合句意，故选B
考点：考查连词的用法
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