As is known mobile phone make it possible for people toeach other conveniently.A. keep in

问题补充：

As is known, mobile phone make it possible for people toeach other conveniently.

A. keep in touch with

B. get in touch

C. lose touch with

D. be connected

答案：

(答案→)A. keep in touch with

B. get in touch

C. lose touch with

D. be connected

解析：考查动词短语用法。keep in touch with与…保持联系符合句意；B项没有with，不能直接和each other 连用。