-Hi，Tracy，you look tired.-I________the living room for three hours.

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• 1Look at the sweat on her face.She________the house since she got up this morning.

  A.is cleaning

  B.has been cleaned

  C.was cleaning

  D.has been cleaning

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• 2—When is Jack going to finish writing that program?—I don't know ______ day in and day out.

  A.He has been working

  B.He has worked

  C.He had been working

  D.He was working

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• 3— What's the price of petrol these days ?   —  It _______ frequently since last year .  

  A.is arisen

  B.increased

  C.has been rising

  D.has raised

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• 4Ever since my brother graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company. 

  A.worked

  B.has been working

  C.is working

  D.works

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• 5— Hi, Jack!When did you arrive in Berlin?— Last weekend. I  __________  a different culture since then.[      ]

  A.was experiencing

  B.will be experiencing

  C.have been experiencing

  D.had been experiencing

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• 6—Hi, which university do you prefer?—Well, I've been considering _____ to Harvard University.

  A.to go

  B.going

  C.gone

  D.being going

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• 7They   ____ on this project for l 4 hours, but it’s so difficult to persuade them to have a rest.    

  A.had worked

  B.have been working

  C.worked

  D.are working

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• 8— Sir, I'm here. — Please listen. I _____ asking your parents to come to our school, but I'd like to hear your opinion first.

  A.have considered

  B.am going to consider

  C.considered

  D.have been considering

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• 9In the past decades, sea ice ____ in the Arctic as a result of global warming.

  A.had melted

  B.has been melting

  C.melted

  D.is melting

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• 10We _____ on our project day and night in the past two weeks.[      ]

  A.had worked

  B.have been working

  C.will be working

  D.are working

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