People around the world ________ Christmas trees ever since 1510．

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• 1Mr．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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• 2I ________ 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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• 3The 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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• 4Professor Smith, a student ________ the whole afternoon．Could you let him in now?

  A.was waiting

  B.is waiting

  C.had waited

  D.has been waiting

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• 5The 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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• 6It ________ 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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• 7We ________ for the bus half an hour, but it has not come yet．

  A.have been waiting

  B.have waited

  C.are waiting

  D.have been waited

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• 8This kind of glasses made by experienced workers ________ comfortably．

  A.is worn

  B.wears

  C.are worn

  D.have worn

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• 9I ________ e-bike to work, but these days I prefer walking with the purpose of losing weight．

  A.ride

  B.have ridden

  C.rode

  D.am to ride

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• 10Listen, boys!This room and serving in it ________ you six．

  A.will be sharing by

  B.is being sharing with

  C.will be shared with

  D.is being shared by

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