Sometimes she talks with Mary over telephone that is to say they keep in touch with each

问题补充：

Sometimes she talks with Mary over telephone，that is to say，they keep in touch with each other by telephone.

A. the；/

B. /；/

C. /；the

D. the；the

答案：

(答案→)A. the；/

B. /；/

C. /；the

D. the；the

解析：

over后加表示通讯的词时要用定冠词；by与表示交通工具或通讯手段的词连用时，省去冠词。

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