Ourgovernmenthastriedmanywaysto   thesmog(雾霾)problem.M...

问题详情：

 Our government has tried many ways to    the smog(雾霾)problem. Maybe we'll have a clear sky in the near future.

       A. put away        B. work out         C.  come up

【回答】

B

知识点：动词和动词短语

题型：选择题