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    23．Many of the systems besides the Milk Way have been measured and some of their distances as well. A．having measured B．being measured C．been measured D．measured 【查看更多】

     

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    Many of the systems besides the Milk Way have been measured and some of their distances_____ as well.

    A．having measured                                         B．being measured

    C．been measured                                           D．measured

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