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(.5分)The air in Beijing is getting much    now than a few years ago.(  ) A.clean B.cleaner  C.cle...

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/; a    an; /    /; /    an; a  
≥1分钟  ≥5分钟  ≥10分钟  ≥20分钟  ≥30分钟  
instead of    instead    in place of    in place  
refers to   comes to   happens to   speaks to  
≥1分钟  ≥5分钟  ≥10分钟  ≥20分钟  ≥30分钟  
problem with    problem of    a problem with    a problem of  
behind  without  beyond  including  
refers to   comes to   happens to   speaks to  

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