They______ when the teacher came in.
A．talk B．a(chǎn)re talkingC．to talkD．were talking
D

試題分析：句意：當(dāng)老師進(jìn)來(lái)時(shí)，他們正在說(shuō)話。結(jié)合語(yǔ)境可知主句描述的是過(guò)去某時(shí)正在進(jìn)行的動(dòng)作，故用過(guò)去進(jìn)行時(shí)態(tài)。選D。
點(diǎn)評(píng)：英語(yǔ)中的時(shí)態(tài)主要是借助于時(shí)間狀語(yǔ)與上下文語(yǔ)境來(lái)進(jìn)行判斷。解答此類(lèi)題型，首先要注意句子中的時(shí)間狀語(yǔ)，如果沒(méi)有則要通過(guò)分析上下文，結(jié)合語(yǔ)境來(lái)判斷句子的時(shí)態(tài)。
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