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It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today.


  1. A.
    that
  2. B.
    when
  3. C.
    what
  4. D.
    how
C
该题考查it作形式主语,what引导主语从句的用法.what引导主语从句,有词汇意义并在主语从句中作主语;that引导主语从句时只起引导作用,无词汇意义,也不能在从句中作任何成分;when表示时间,在主语从句中作状语;how表示方式,在主语从句中作方式状语.句意是:今天,什么控制二氧化碳在大气内外流动已被人们很好地理解.答案为C.
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