2. 外语
  3. It is Aestimated that a scientific principle has Ba life expectancy of approximately a Cdecade before Dit drastically revised or

It is Aestimated that a scientific principle has Ba life expectancy of approximately a Cdecade before Dit drastically revised or

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问题 It is Aestimated that a scientific principle has Ba life expectancy of approximately a Cdecade before Dit drastically revised or replaced by newer information.
选项 A、 
B、 
C、 
D、 
答案D
解析 it drastically改为it is drastically，用被动语态。
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