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    21、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

    21、D

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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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