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
网友回答
(答案→)A. 不填;the
B. 不填;a
C. the;不填
D. the; a
解析:over [on] the telephone 为习语,意为“通过电话”;若用 by telephone 则不用冠词,类似地,by letter(通过信件)也不用冠词。