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题目内容
（国家开放大学管理英语3.）
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.
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.
参考答案