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    Don’t download anything unless you make sure ___________.

    A. where it is from                             B. where it would be from

    C. where is it from                             D. where had it been from

    1、A

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    Don’t download anything unless you make sure ___________.

    A. where it is from                             B. where it would be from

    C. where is it from                             D. where had it been from

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