Why does the author say that door-knocking has become a lost art? 回答　A. It is not effective, no one will take this method any more. 　B. People focus on privacy increasingly, so door-knocking seems like an intrusion into other people.s lives 　C. It is very difficult to do door-knocking，no one knows how to do it now.

Why does the author say that door-knocking has become a lost art? 回答

　A. It is not effective, no one will take this method any more.

　B. People focus on privacy increasingly, so door-knocking seems like an intrusion into other people.s lives

　C. It is very difficult to do door-knocking，no one knows how to do it now.

出自：国家开放大学管理英语3.

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