Over the past decades, sea ice _____ in the Arctic as a result of global warming.

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• 1— Hi, Tracy, you look tired. — I am tired. I ____ the living room all day.

  A.painted

  B.had painted

  C.have been painting

  D.have painted

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• 2How tired you look! You _____ these weeks. I think you need a holiday before you burn out.

  A.had overworked

  B.overworked

  C.have been overworking

  D.were overworked

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• 3It's nice to see you again. What _____ since we last met?

  A.have you done

  B.had you done

  C.have you been doing

  D.did you do

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• 4Hi, Peter! I haven't heard much from you lately. What ______ you ______?

  A.have…done

  B.have… been doing

  C.did…do

  D.are…going to do

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• 5Now that she is out of a job, Lucy ______ going back to school, but she hasn't decided yet.

  A.had considered

  B.is going to consider

  C.has been considering

  D.considered

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• 6Since the beginning of the vacation, I ______ across the country, and my next stop is the Wuyi Mountains.

  A.had traveled

  B.will travel

  C.have been traveling

  D.was traveling

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• 7I have to see the doctor because I _____ a lot lately.

  A.have been coughing

  B.had coughed

  C.coughed

  D.cough

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• 8The prices _________ up all the time and no one knows when it will become stable.

  A.had gone

  B.have been going

  C.have gone

  D.had been going

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• 9— I wonder if you could go with me to the supermarket.— Don't disturb me. I        my experiment report all the morning and haven't finished yet.

  A.write

  B.was writing

  C.have written

  D.have been writing

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• 10I _______ English since I was very young but still can't communicate fluently in it.  

  A.study

  B.have been studying

  C.studied

  D.am studying

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