I often have conversation with John over phone, but keep in touch with Tom by writing letters.
A. /; the
B. /; a
C. the; /
D. the; a
网友回答
A. /; the
B. /; a
(答案→)C. the; /
D. the; a
解析：考查冠词。第一空为固定短语：通过电话over the phone，第二空：写信write letters，letters前不需要加冠词，所以选C。