题目内容

They______ when the teacher came in.
A．talk B．are talkingC．to talkD．were talking
D

试题分析：句意：当老师进来时，他们正在说话。结合语境可知主句描述的是过去某时正在进行的动作，故用过去进行时态。选D。
点评：英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型，首先要注意句子中的时间状语，如果没有则要通过分析上下文，结合语境来判断句子的时态。
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