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    Today E-mails ________ in both cities and countryside because they are much faster and cheaper than letters．

    A．are used          B．are using          C．were used              D．were using

    1、A

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    Today E-mails ________ in both cities and countryside because they are much faster and cheaper than letters．

    A．are used          B．are using          C．were used              D．were using

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