Professor Smith, a student ________ the whole afternoon．Could you let him in now?

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• 1The company ________ a rise in salary for ages, but nothing has happened yet．

  A.promises

  B.promised

  C.has been promising

  D.had promised

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• 2We ________ here for two days, and we'll go on for another two days．

  A.have been staying

  B.had stayed

  C.shall stay

  D.will have stayed

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• 3They ________ us since five o'clock this morning．

  A.are helping

  B.have been helping

  C.have been helped

  D.have helped

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• 4I am sick of rain and bad weather! Hopefully, when we ________ up tomorrow morning, the sun ________．

  A.wake; will be shining

  B.will wake; is shining

  C.will wake; shines

  D.wake; shines

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• 5Cotton ________ in the southeast of China since a long time ago．

  A.is grown

  B.has been grown

  C.was grown

  D.has been growing

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• 6The foreign scientist ________ in our college for eight years and doesn't want to leave．

  A.worked

  B.works

  C.is working

  D.has been working

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• 7I ________ the book the whole day, yet I haven't finished it．

  A.have been reading

  B.have read

  C.am reading

  D.had been reading

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• 8Mr．Smith ________ these days．I think he should take a holiday before he burns out．

  A.has been overworking

  B.overworked

  C.had overworked

  D.was overworking

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• 9People around the world ________ Christmas trees ever since 1510．

  A.decorated

  B.have decorated

  C.have been decorated

  D.have been decorating

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• 10It ________ non-stop for the three days since Monday．Look, it's raining so hard now．

  A.has rained

  B.is raining

  C.has been raining

  D.has been rained

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