20、Nowadays, many people often have conversations with friends in the same city over       telephone, while keeping in touch with friends in other cities by         e – mail.

A．/; the                          B．/; a                      C．the; /                   D．the; a

20、C

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Nowadays, many people often have conversations with friends in the same city over       telephone, while keeping in touch with friends in other cities by         e – mail.

A．/; the                          B．/; a                      C．the; /                   D．the; a

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