1. When I got to the station, the train ____ already ______ (leave).
2. The stone bridge______________ (build) in our hometown for ten years.
3. The desk must ______ (clean) once a day.
4. The dog _________ (lie) on the floor when I came in..
5. It _________(rain) heavily when I got home.
6. Her mother____________ (cook) at this time yesterday.
7. The students _____________ (do) their homework. __________ (not make) any noise!
8. ----______ you ever_______ (be) to Beijing? ----Yes. I________ (go) there last week.
9. Hell telephone us as soon as he _________ (arrive) there.
10. Jiefang trucks____________ (make) in Changchun.
答案
had left
have been built
be cleaned
was lying
was raining
was cooking
are doing, Dont make
have beeen, went
arrives
are made
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