Our monitor talks about Mars as if he ______ a scientist.

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• 1Daniel's father left home in 2001，and ______ ever since．

  A.has not heard of

  B.had not heard of

  C.has not been heard of

  D.had not been heard of

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• 2--- Have you been here before? ---- This is the second time I ______to the Great Wall.

  A.comes

  B.have been

  C.came

  D.had come

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• 3You can't use the machine today because some parts___________this week.

  A.are replaced

  B.are being replaced

  C.have replaced

  D.are replacing

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• 4We______ writing a letter of complaint to the manager himself．But we'd like to hear your opinion first．

  A.have been thinking of

  B.had thought of

  C.were thinking of

  D.thought of

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• 5I'd like to have visited the Palace Museum, but something unexpected _______ to my father.

  A.had happened

  B.happened

  C.has happened

  D.happens

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• 6．The moment I got home, I found I _______ my jacket on the playground.

  A.had left

  B.left

  C.have left

  D.was leaving

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• 7She has been given three free tickets for tomorrow's concert and she ______ there with two of her best friends.

  A.has gone

  B.is going

  C.has been

  D.went

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• 8If my father ______here now,  he _____ tell me what to do. But he left home just one hour ago.

  A.were, would

  B.were, will

  C.is , would

  D.is, will

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• 9—Those scientists invented a robot to care for kids! —It's not surprising．They ________ wonders all the time．

  A.worked

  B.were working

  C.work

  D.have been working

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• 10---Why do you keep looking back? ---I have a feeling that we _______.

  A.were followed

  B.have been followed

  C.are being followed

  D.are following

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