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Heavy smog blankets Beijing.        ,city authorities start using its new smog warning system.
A.In turnB.In time C.In responseD.In return
C               
             
试题分析:考查介词短语辨析。A.In turn 轮流;B.In  time及时;C. In  response作出回应;D. In  return作为报答。句意:严重的雾霾覆盖北京,作为回应,城市当局可使用新的雾霾警告系统。根据句意,上文提到雾霾严重,故作出回应,所以选C项。          
考点 : 考查介词短语辨析
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