2. 职称英语
  3. Pollution has become a serious problem in almost all the big cities of the wo

Pollution has become a serious problem in almost all the big cities of the wo

游客2024-07-19  6
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 [br]  
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解析 因为放在介词without之后，所以用动名词形式。
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