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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
該題考查it作形式主語,what引導(dǎo)主語從句的用法.what引導(dǎo)主語從句,有詞匯意義并在主語從句中作主語;that引導(dǎo)主語從句時只起引導(dǎo)作用,無詞匯意義,也不能在從句中作任何成分;when表示時間,在主語從句中作狀語;how表示方式,在主語從句中作方式狀語.句意是:今天,什么控制二氧化碳在大氣內(nèi)外流動已被人們很好地理解.答案為C.
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