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    科目： 来源： 题型：单选题

    With the greatest difficulty, they ________ swim to the other side of the river.


    1. A.
      can
    2. B.
      could
    3. C.
      were able to
    4. D.
      could be able to

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    科目： 来源： 题型：单选题

    I decided to quit the job, because I felt my boss hard _________．


    1. A.
      to be satisfied
    2. B.
      to satisfy
    3. C.
      satisfied
    4. D.
      being satisfied

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    科目： 来源： 题型：单选题

    Scientists have created ________ antelligent food wrapping material that changes color if ________ acontents are going bad．


    1. A.
      an; 不填
    2. B.
      不填; the
    3. C.
      an; the
    4. D.
      the; 不填

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    科目： 来源： 题型：单选题

    Let Mary play with your toys as well, Tina, you must learn to ________．


    1. A.
      spare
    2. B.
      take
    3. C.
      support
    4. D.
      share

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    科目： 来源： 题型：单选题

    Looking round the town, he felt as though he ________ away for ages.


    1. A.
      has been
    2. B.
      was
    3. C.
      is
    4. D.
      had been

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    科目： 来源： 题型：单选题

    We should protect the trees from ____________.


    1. A.
      destroy
    2. B.
      destroying
    3. C.
      being destroyed
    4. D.
      be destroyed

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    科目： 来源： 题型：单选题

    The workers ________ that the company make an apology to the girl publicly for what they had done to her．


    1. A.
      asked
    2. B.
      demanded
    3. C.
      said
    4. D.
      promised

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    科目： 来源： 题型：单选题

    It was in the classroom ________ I found his key ________ the door.


    1. A.
      where, to
    2. B.
      that, to
    3. C.
      where, at
    4. D.
      which, at

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    科目： 来源： 题型：单选题

    The smoke from the fire was ________ thick for them ________ on the roof .


    1. A.
      so, can't land
    2. B.
      such, not to land
    3. C.
      too, cannot land
    4. D.
      too, to land

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    科目： 来源： 题型：单选题

    By the middle of this century, the majority of the world’s population ________ in cities．


    1. A.
      will be living
    2. B.
      are living
    3. C.
      have lived
    4. D.
      will have lived

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