Question

Mom often has conversations with my sister over ________ phone, while keep in touch with me by ________ letterMom often has conversations with my sister over ________ phone, while keep in touch with me by ________ letter.

1. A.
   不填; the
2. B.
   不填; a
3. C.
   the; 不填
4. D.
   the; a

Answer 1

C
解析：
第一个空填the是特指那部电话；
第二个空不填；
by letter固定搭配，用通信的方式第一个空填the是特指那部电话；
第二个空不填；
by letter固定搭配，用通信的方式。