Lesson 77 A successful operation一例成功的手术First listen and then answer the question.听录音，然后回答以下问题。Did the doctors find out h
新概念英语第二册第77课:A successful operation。。。Lesson 77 A successful operation一例成功的手术First listen and then answer the question.听录音，然后回答以下问题。Did the doctors find out h
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