We ___________ when the teacher came in.
A．were talkingB．talked
C．talkD．a(chǎn)re talking
A
A “正在做某事時(shí)，某事突然發(fā)生”常用when，即be doing sth. When sth. else did（用動(dòng)詞的過去式）�！拔覀冋谡勗挄r(shí)，老師進(jìn)來了�！惫视眠^去進(jìn)行時(shí)。故選A。
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