—Why does the river smell terrible? —Because large quantities of water__________．

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• 1I became a teacher in 1993. I _______ for 13 years by next summer.

  A.has taught

  B.will teach

  C.has been teaching

  D.will have been teaching

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• 2-----Do you know if the old man is still living? ----- I'm sorry. He_______. He_______ for two months.

  A.died, has died

  B.has died, has been dead

  C.has been dead, died

  D.has died, has dead

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• 3—I don't know why Tom was absent from yesterday's meeting. —He must have been sick, _______？

  A.isn't he

  B.didn't he

  C.wasn't he

  D.mustn't he

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• 4It is everybody's desire that every effort_________ to reduce the pollution in our city.

  A.was made

  B.be made

  C.will be made

  D.would be made

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• 5The film ______for ten minutes.

  A.has begun

  B.has been begun

  C.has been on

  D.began

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• 6---Hi, Tom. ---Hello, Fancy. I ______ you were here.

  A.don't know

  B.won't think

  C.think

  D.didn't know

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• 7There was no room for you. All the seats ______.

  A.are taken

  B.was taken

  C.had taken

  D.had been taken

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• 8Our monitor, who by then ______ admission to Fudan University, decided to do some part-time jobs to gain more practical experience.

  A.gained

  B.was gaining

  C.has gained

  D.had gained

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• 9Stop! A little boy_________ the street.

  A.is crossing

  B.crosses

  C.crossed

  D.has crossed

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• 10A new school ______ these days.

  A.is building

  B.is built

  C.well build

  D.is being built

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