17. (单选题) I often have conversations with John over _____( )____telephone, while keep in touch with Tom by_____( )_____ letter.(本题3.5分) A、不填;;the B、不填;a C、 the;不填 D、 the;a

17. (单选题) I often have conversations with John over _____( )____telephone, while keep in touch with Tom by_____( )_____ letter.(本题3.5分)
A、不填;;the
B、不填;a
C、 the;不填
D、 the;a

出自：赤峰学院-英语

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