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    科目： 来源：不详 题型：单选题

    The suggestion they all objected to________to be effective finally.
    A．provingB．proveC．had provedD．proved

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    科目： 来源：不详 题型：单选题

    —Sorry, I didn’t hear the door bell ring.
    —Your bell         . Perhaps it needs repairing.
    A．never workedB．is never working
    C．never worksD．had never worked

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    科目： 来源：不详 题型：单选题

    How to control housing price is said to       a great challenge facing the government over the past few years.
    A．becomeB．becomingC．have becomeD．be becoming

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    科目： 来源：不详 题型：单选题

    —— May I see you at 4 o’clock this afternoon?
    —— I’m afraid not, I      a charity meeting then.                                                                                                                                           
    A．will attendB．have attendedC．will be attendingD．was attending

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    科目： 来源：不详 题型：单选题

    By the time Fred gets back home, his girlfriend       for London to study.
    A．will have leftB．leavesC．has leftD．will leave

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    科目： 来源：不详 题型：单选题

    My parents have promised to come to see me before I ____for Africa.
    A．have leftB．leaveC．leftD．will leave

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    科目： 来源：不详 题型：单选题

    By the time these books were published,  he _____ addicted to them.
    A．had becomeB．becomesC．has becomeD．became

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    科目： 来源：不详 题型：单选题

    It was the first time we _______ a film in the cinema together as a family.
    A．seeB．had seenC．sawD．have seen

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    科目： 来源：不详 题型：单选题

    Stop! You can never touch this machine when it ________, it is very dangerous.
    A．has been operatedB．will be operated C．is operated D．is being operated

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    科目： 来源：不详 题型：单选题

    Some of the wolves there _________ their fur.
    A．are hunting B．are hunting for C．are hunted forD．hunt for

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