选择什么?All the students______sports at this time yesterday.All the students______sports at this time yesterday.A.did B.are doing C.were doing D.have done

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选择什么?All the students______sports at this time yesterday.All the students______sports at this time yesterday.A.did B.are doing C.were doing D.have done
选择什么?All the students______sports at this time yesterday.
All the students______sports at this time yesterday.
A.did B.are doing C.were doing D.have done

选择什么?All the students______sports at this time yesterday.All the students______sports at this time yesterday.A.did B.are doing C.were doing D.have done
C.were doing,
首先,发生的昨天,D,B 是不可能适合的.
A.did,一般过去,表示“在过去开始/发生并结束”,与at this time yesterday 不吻合.
再说,at this time yesterday,强调昨日的此时/阶段,正发生的事,何时开始?不一定知道!何时结束?也不一定知道.

C
at this time 进行时
yesterday 过去式

选C,过去进行时。