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

A．a(chǎn)re used          B．a(chǎn)re using          C．were used              D．were using

7、A

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

A．a(chǎn)re used          B．a(chǎn)re using          C．were used              D．were using

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