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    科目： 来源：上海高考真题 题型：单选题

    With the help of high technology, more and more new substances _____ in the past years.
    [     ]
    A. discovered
    B. have discovered
    C. had been discovered
    D. have been discovered

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    科目： 来源：陕西省高考真题 题型：单选题

    Though we don't know what is discussed, yet we can feel the topic _______.
    [     ]
    A. had changed
    B. will change
    C. was changed
    D. has been changed

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    科目： 来源：上海高考真题 题型：单选题

    In recent years many football clubs _____ as business to make a profit.
    [     ]
    A. have run
    B. have been run
    C. had been run
    D. will run

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    科目： 来源：高考真题 题型：单选题

    — The window is dirty.
    —  I know. It _____ for weeks.
    [     ]
    A. hasn't cleaned
    B. didn't clean
    C. wasn't cleaned
    D. hasn't been cleaned

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    科目： 来源：0123 期末题 题型：单选题

    After years of efforts, Chinese Olympic dream _____ in the end.
    [     ]
    A. comes true
    B. has been come true
    C. has been turned into reality
    D. had been turned into reality

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    科目： 来源：0101 期末题 题型：单选题

    Millions of RMB yuan's worth of damage to the environment ______ by the poisonous chemical
    that flew into the river.

    [     ]

    A. has been caused
    B. has caused
    C. will be caused
    D. caused

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    科目： 来源：0103 期末题 题型：单选题

    — Why do you look so worried?
    — My computer broke down and my essay _____ since.

    [     ]

    A. has been left unfinished
    B. has left to finish
    C. was left to finish
    D. had been left unfinished

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    科目： 来源：0108 期中题 题型：单选题

    All the students are excited about the good news that next Sunday we will go camping. But
    when and where to camp _________ yet.

    [     ]

    A. are not discussed
    B. haven't been discussed
    C. is not being discussed
    D. hasn't been discussed

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    科目： 来源：0127 期中题 题型：单选题

    — Will you attend the meeting this afternoon?
    — But I ________ anything about that.

    [      ]

    A. hadn't been told
    B. haven't been told
    C. didn't tell
    D. won't tell

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    科目： 来源：0110 期中题 题型：单选题

    Every necessary means____ to protect milu deer which____ very valuable to us. As a result,
    the number of milu deer is increasing.

    [      ]

    A. are used; is
    B. is being used; is
    C. have been used; are
    D. has been used; are

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