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    The factory ______ its waste into the river, but now it deals with the waste in a new way.

        A. used to dump                 B. is used to dump

    C. used to dumping              D. is used to dumping

     

    【答案】

    A

    【解析】used to do表示过去常常做某事，现在不做了。be used to do被用来做某事，be used to doing经常做某事。

     

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