A. In the twentieth century , many books have been produced in paper-back editions . B. At work, your clothes must convey the

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问题    A. In the twentieth century , many books have been produced in paper-back editions .
   B. At work, your clothes must convey the message that you are competent, reliable and authoritative.
   C. At the medical conference, Dr. Dong felt quite confident in his area of research and was able to perform well in his presentation.
   D. Many students today display a worrying tendency to choose universities , fields of study and careers on the basis of earning potential.
20世纪,许多书籍都以平装印刷发行。

选项 A、 
B、 
C、 
D、 

答案A

解析 根据many和books可得。
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