We ___________ when the teacher came in.
A．were talkingB．talked
C．talkD．are talking
A
A “正在做某事時，某事突然發(fā)生”常用when，即be doing sth. When sth. else did（用動詞的過去式）�！拔覀冋谡勗挄r，老師進來了。”故用過去進行時。故選A。
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