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I often have conversations with John over ______ telephone, while keep in touch with Tom by ______ letter.

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

I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.

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

 I often have conversations with John over ______ telephone, while keep in touch with Tom by ______ letter.

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

I often have conversations with John over ______ telephone, while keep in touch with Tom by ______ letter.

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

I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.

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