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They______ when the teacher came in.

A．talk

B．are talking

C．to talk

D．were talking

試題分析：句意：當老師進來時，他們正在說話。結合語境可知主句描述的是過去某時正在進行的動作，故用過去進行時態。選D。
點評：英語中的時態主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結合語境來判斷句子的時態。

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