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    科目： 来源：不详 题型：单选题

    The past two years ________ a sharp rise in oil price，which adds to the burden of auto transportation industry.
    A．witnessedB．has witnessed
    C．is witnessingD．witnesses

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    科目： 来源：不详 题型：单选题

    —Peter！Let's hurry.The boss is coming.
    —Oh，I was afraid that we ________ her.
    A．missB．had missed
    C．will missD．have missed

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    科目： 来源：不详 题型：单选题

    —Why do you look so puzzled?
    —Oh，I ________ over a most difficult maths problem.
    A．thoughtB．have thought
    C．am thinkingD．think

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    科目： 来源：不详 题型：单选题

    I don't remember who came first，but we all________the lecture.
    A．attendB．attended
    C．have attendedD．are attending

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    科目： 来源：不详 题型：单选题

    Nowadays，more Chinese provinces________education reforms that will allow children of migrant workers to sit college entrance exams locally.
    A．have announced B．are announcing
    C．announcedD．will announce

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    科目： 来源：不详 题型：单选题

    George once told me that he would visit our house，but，for various reasons，he________so far.
    A．didn'tB．hasn't
    C．hadn'tD．wouldn't

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    科目： 来源：不详 题型：单选题

    (2013·高考重庆卷)—It rained cats and dogs this morning.I’ m glad we took an umbrella.
    —Yeah，we would have got wet all over if we________.
    A．hadn’tB．haven’t
    C．didn’tD．don’t

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    科目： 来源：不详 题型：单选题

    (2013·高考江苏卷)I should not have laughed if I________ you were serious.
    A．thoughtB．would think
    C．had thoughtD．have thought

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    科目： 来源：不详 题型：单选题

    (2013·高考新课标全国卷Ⅰ)When I first met Bryan I didn’t like him，but I________my mind.
    A．have changed　　　B．change
    C．had changedD．would change

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    科目： 来源：不详 题型：单选题

    (2013·高考新课标全国卷Ⅰ)If we________now to protect the environment，we’ll live to regret it.
    A．hadn’t actedB．haven’t acted
    C．don’t actD．won’t act

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