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    科目： 来源： 题型：单选题

    We must keep the classroom clean for dirt and disease go ________．


    1. A.
      from time to time
    2. B.
      hand in hand
    3. C.
      one after another
    4. D.
      step by step

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    科目： 来源： 题型：单选题

    Can you ________ the differences between the twins?


    1. A.
      know
    2. B.
      say
    3. C.
      spot
    4. D.
      speak

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    科目： 来源： 题型：单选题

    It is believed that more than one person may ________ for the mine accident．


    1. A.
      be to blame
    2. B.
      blame
    3. C.
      punish
    4. D.
      be to punish

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    科目： 来源： 题型：单选题

    I’m afraid your mobile phone has to get ________ before it works normally again．


    1. A.
      changed
    2. B.
      charged
    3. C.
      cleaned
    4. D.
      electrified

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    科目： 来源： 题型：单选题

    The new law to punish the drunk driver will come into ________ on the day it passes．


    1. A.
      existence
    2. B.
      use
    3. C.
      service
    4. D.
      effect

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    科目： 来源： 题型：单选题

    Does anybody know how it ________ to live without eating for so many months?


    1. A.
      keeps
    2. B.
      manages
    3. C.
      succeeds
    4. D.
      tries

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    科目： 来源： 题型：单选题

    ________ it carefully can we hope to find a way to solve the challenging problem．


    1. A.
      When we observe
    2. B.
      When to observe
    3. C.
      That we should only observe
    4. D.
      Only by observing

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    科目： 来源： 题型：单选题

    I thought I was going to fail the driving test but I succeeded ________．


    1. A.
      after all
    2. B.
      first of all
    3. C.
      in all
    4. D.
      at all

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    科目： 来源： 题型：单选题

    We were looking for you all this morning．You ________ office without a word．


    1. A.
      mustn’t leave
    2. B.
      shouldn’t have left
    3. C.
      couldn’t have left
    4. D.
      needn’t leave

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    科目： 来源： 题型：单选题

    The two collectors have determined to buy the precious Egyptian vase, ________．


    1. A.
      however much it costs
    2. B.
      no matter how it costs
    3. C.
      however much does it cost
    4. D.
      no matter how much does it cost

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