2. 外语
  3. Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried

Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried

admin2014-08-07  64
问题    Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried about how they can  (11)   pollution. They are also concerned about whether the government is doing enough to  (12)   the e
  
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答案creating
解析 因为放在介词without之后，所以用动名词形式。
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