Ourgovernmenthastriedmanywaysto

问题详情：

Our government has tried many ways to _________ the smog haze(雾霾) problem. Maybe we’ll

      have a clear sky in the near future.

A. come up with        B. put away            C. set up                D. work out

【回答】

D

知识点：动词和动词短语

题型：选择题