As is known to us, theory is based on practice and     servers practice.A. by

  As is known to us, theory is based on practice and     servers practice.A. by

题型:不详难度:来源:
  
As is known to us, theory is based on practice and     servers practice.
A. by chance  B. in turn   C. in return  C. by turn
答案
B
解析

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