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[语文] 求教一道填空题,谢谢!

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发表于 2019-9-9 15:49:29 | 显示全部楼层 |阅读模式
请问第二空为什么选E呢?
3.      At one time researchers viewed the placebo effect as (i)_____,a statistical (ii)_____ faced by those attempting an objective evaluation ofthe efficacy of potentially legitimate therapies. That view has changed: the placebo effect istoday seen as an important part of the healing process.
  
A. a boon
  
  
D. increment
  
  
B. a touchstone
  
  
E. annoyance
  
  
C. an impediment
  
  
F. deviation
  


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