Question

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

Answer 1

C

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。