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    Such a problem still exists because no adequate measures for preventing it _____ taken in the past.

    A. are
    B. had
    C. were
    D. had been.
    C
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    科目：高中英语 来源：专项题 题型：单选题

    Such a problem still exists because no adequate measures for preventing it _____ taken in the past.
    [     ]
    A. are
    B. had
    C. were
    D. had been.

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