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18.-What were they doing when the UFO arrived?
-_______________.(  )
A.Certainly.They are cleaning their classroom
B.They was studying in the library
C.They were eating lunch in the restaurant
D.They were talked on the phone

分析 ---当UFO到达时他们在干什么?
---他们正在餐馆里吃午饭.

解答 答案:C.根据问句"What were they doing when the UFO arrived?"可知答语也要用过去进行时.过去进行时的构成"主语+were/was+doing".故选C.B也是过去进行时,但主语是they,be动词要用were而不是was.故选C.

点评 本题要求掌握过去进行时的构成.根据问话知道所用的时态是过去进行时,故答语也要用过去进行时.

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