I often have conversations with John over telephone while keep in touch with Tom by lett

问题补充：

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

答案：

A. 不填;;the

B. 不填;a

(答案→)C. the;不填

D. the; a

解析：本题考查冠词的用法。前一个空over the telephone表示“通过电话”；by letter表示“通过写信”，by表示方式后直接接一个名词。

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