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    科目： 来源：模拟题 题型：单选题

    My new issue of Twenty-first Century School Edition has disappeared. Who _____ have taken it?
    [     ]
    A. should
    B. must
    C. could
    D. would

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    科目： 来源：北京期末题 题型：单选题

    — It's eight o'clock already. Jack _____ be here by now.
    — Oh, he told me that he was going to see his dentist and wouldn't be back until ten.
    [     ]
    A. must
    B. can
    C. should
    D. need

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    科目： 来源：辽宁省模拟题 题型：单选题

    _____ anyone phone, tell them I'm in conference.
    [     ]
    A. Would
    B. Shall
    C. Could
    D. Should

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    科目： 来源：河南省模拟题 题型：单选题

    — Who is late for class again?
    — _____ you ask? Tim, of course.
    [     ]
    A. Can
    B. Would
    C. Could
    D. Need

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    科目： 来源：浙江省模拟题 题型：单选题

    The room is in a terrible mess, it _____ have been cleaned.
    [     ]
    A. can't
    B. mustn't
    C. shouldn't
    D. wouldn't

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    科目： 来源：北京期末题 题型：单选题

    For the engine to work, the green button _____ be in the "on" position.
    [     ]
    A. can
    B. would
    C. must
    D. might

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    科目： 来源：四川省模拟题 题型：单选题

    Sometimes we _____ be busy shopping in a supermarket, for it's more convenient to purchase online nowadays.
    [     ]
    A. needn't
    B. mustn't
    C. shouldn't
    D. can't

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    科目： 来源：黑龙江省模拟题 题型：单选题

    — Is Jack on duty today?
    — It ____ be him; it's his turn tomorrow.
    [     ]
    A. mustn't
    B. won't
    C. can't
    D. needn't

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    科目： 来源：河北省期末题 题型：单选题

    In fact you ____ outside by taxi. My car was here.
    [     ]
    A. couldn't go
    B. mustn't have gone
    C. needn't have gone
    D. needn't go

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    科目： 来源：上海高考真题 题型：单选题

    Some young people these days just ____ go out of their homes to contact the real world.
    [     ]
    A. mustn't
    B. won't
    C. mightn't
    D. shouldn't

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