题目内容：
Dialogue TwoFrank: I just received a letter from one of my old high school buddies.
Sarah: ____5____
Frank: Well, actually I haven' t heard from him in ages.
Sarah: To be frank with you, I've been out of touch with most of my old friends. ____6____
Frank: I know. it' s really hard to maintain contact when people move around so much.
Sarah: That' s right.____ 7____ But you' re lucky to be back in touch with your buddy again.
第5题_________ A．People just drift apart!
B．That' s nice !
C．Only one or two still keep me posted about what they are doing.
D．Do you often keep in touch with them?
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答案解析：