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    One feature that is the program is that the file manager has a word processor that understands English language database queries and that it combines four powerful productivity products in a single package. A. essential to B. vital to C. unique to D. valuable to 【查看更多】

     

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    One feature that is ______ the program is that the file manager has a word processor that understands English

    language database queries(查询) and that it combines four powerful productivity products in a single package.

       A. essential to    B. vital to   C. unique to   D. valuable to

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