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    科目： 来源：不详 题型：单选题

    Earth is believed ______ by an object the size of Mars at some point in the distant past  
    before its surface cooled．
    A．to be hitB．to have hit C．to have been hitD．to hit

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    科目： 来源：不详 题型：单选题

    ---- Have you ever seen a dictionary ____________ our school library?
    ---- Yes, it is over there and Mary is using it.
    A．belonging toB．belonged to
    C．being belonged toD．belong to

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    科目： 来源：不详 题型：单选题

    There are several factors _______ in the economy _______ make it difficult to predict the future.
    A．operate; whereB．operating; whichC．to operate; thatD．operated; what

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    科目： 来源：不详 题型：单选题

    ______ a happy life, try to look at the positive side in every situation.
    A．LivingB．To liveC．Having livedD．Live.

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    科目： 来源：不详 题型：单选题

    Unfortunately, the element Madam Curie devoted all her life              her death.
    A．to causedB．causingC．to be causedD．to causing

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    科目： 来源：不详 题型：单选题

    When first __________ to the market, the computer software was not a success due to its complexity in operation.
    A．introducingB．being introduced
    C．introducedD．to be introduced

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    科目： 来源：不详 题型：单选题

    It remains doubtful whether the project _____________ next month will bring profits to the company.
    A．accomplishedB．to be accomplished
    C．having accomplishedD．being accomplished

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    科目： 来源：不详 题型：单选题

    Professor Smith, along with his assistants, ________ on the project day and night to meet the deadline.
    A．workB．workingC．are workingD．is working

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    科目： 来源：不详 题型：单选题

    I prefer studying English at home         the match.
    A．to watchingB．to watchC．rather than watchD．rather than watching

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    科目： 来源：不详 题型：单选题

    We shouldn’t think barefoot running strange. It’s normal, fun and comfortable if _____ properly.
    A．doingB．to doC．doneD．being done

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