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    Do you know many man-made satellites _____ space by our scientists since the middle of the twentieth century?

    A. have sent into
    B. were carried into
    C. have been sent into
    D. have been brought into
    C
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    科目：高中英语 来源：同步题 题型：单选题

    Do you know many man-made satellites _____ space by our scientists since the middle of the twentieth century?
    [     ]
    A. have sent into
    B. were carried into
    C. have been sent into
    D. have been brought into

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