—Why does the lake smell terrible? —Because large quantities of water ________.

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• 1—Oh no! We're too late. The train ______. —______. That's OK. We'll catch the next train to London.

  A.was leaving

  B.had left

  C.has left

  D.has been leaving

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• 2In the less than two months since the reality television show—'Where Are We Going , Dad?' first aired, the show _________to the top of Chinese television ratings．

  A.had climbed

  B.has climbed

  C.climbed

  D.was climbing

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• 3—Didn't the guard see him breaking into the bank?  —No, he ______ in the other direction. 

  A.was looking

  B.had looked

  C.looked

  D.is looking

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• 4The habit is something that someone does repeatedly and often does not ________ because they have done it so many times before.

  A.know

  B.understand

  C.experience

  D.realize

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• 5I had wanted to help you last night but I couldn't spare any time, for I ________ a composition which I have to hand in this morning.

  A.wrote

  B.was writing

  C.had written

  D.have written

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• 6A lot of people often forget that oral exams ________ to test our communicative ability.

  A.design

  B.are designed

  C.are designing

  D.are being designed

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• 7I am disappointed because I _________my favourite writer yet.

  A.didn't see

  B.haven't seen

  C.don't see

  D.have not been seeing

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• 8When he ________ the door，he found his keys were nowhere.

  A.would open

  B.opened

  C.had opened

  D.was to open

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• 9–Why do you know so much detail about the accident? --I ________ a walk nearby when it happened.

  A.had

  B.had had

  C.was having

  D.would have

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• 10________ a certain doubt among the people as to the practical value of the project.

  A.It has

  B.They have

  C.It remains

  D.There remains

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