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.
A.不填; the
B.不填; a
C.the; 不填
D.the; a
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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。