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    Every possible means ______ but no one knows which is suitable.

    A. has discussed
    B. have been discussed
    C. has been discussed
    D. were discussed
    C
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    科目：高中英语 来源：0123 月考题 题型：单选题

    Every possible means ______ but no one knows which is suitable.
    [     ]
    A. has discussed
    B. have been discussed
    C. has been discussed
    D. were discussed

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