题目内容

It is already well understood        causes the global warming.
A．whatB．whenC．thatD．how
A               
             
试题分析：考查连词。句意 这让我们很好的了解， 什么导致了全球变暖。It做形式主语，真正的主语是后面的主语从句      causes the global warming ，主语从句缺少主语用what“什么”引导， 所以选A项。       
考点 : 考查连词
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