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  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  84
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thinking of
解析 这里是现在分词与are构成现在进行时，意为“正在考虑…”。
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本试题收录于： 大学英语三级B级题库大学英语三级分类
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