In the past few years, sea ice _______ in the Arctic as a result of global warming.

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• 1-—David has gone to Australia on business. —Really? I ______ why he was absent from today's meeting.

  A.am wondering

  B.wonder

  C.was wondering

  D.had wondered

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• 2-----Is this the first time you______ Chengdu? -----No. But the first time I______ here, the city wasn't so beautiful

  A.visited; came

  B.visited; have come

  C.have visited ; have come

  D.have visited; came

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• 3The first edition __________in 1955 and _________a best seller ever since.

  A.was published; had been

  B.had been published; had been

  C.has been published; has been

  D.was published; has been

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• 4Mary said that she________ London.

  A.has never gone to

  B.has never been ,to

  C.had never been to

  D.had never gone to

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• 5---Our family ______ to Taiwan Island this coming holiday. ---Have a great time!

  A.have traveled

  B.went traveling

  C.are traveling

  D.would travel

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• 6She went to American two years ago .She _______there for half a year and then went to Japan.

  A.would work

  B.worked

  C.would be working

  D.has been working

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• 7Jack doesn't smoke now, but he ______________ for almost twenty years.

  A.was smoking

  B.smoked

  C.has smoked

  D.had smoked

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• 8—Why do you look so worried? —My Macbook Pro broke down and my paper _____unfinished since.

  A.was left

  B.has left

  C.left

  D.has been left

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• 9The general demanded that the soldiers______ at the village before 5 p.m. to rescue the victims of the earthquake.

  A.will arrive　　　　

  B.arrive

  C.would arrive

  D.arrived

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• 10The three of us ________ around Europe for about a month last summer.

  A.travelled

  B.have travelled

  C.had travelled

  D.travel

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