来自乔美荷的问题
trytodo和trydoing的区别（有题目）Previously,Frence'stelecomsregulationauthoritytried_____(encourage)concertaudiencestousethevibratemodeortoswitchesofftheirphonesentirely.However,itmetwithnoapparentsuccess.为
trytodo和trydoing的区别（有题目）
Previously,Frence'stelecomsregulationauthoritytried_____(encourage)concertaudiencestousethevibratemodeortoswitchesofftheirphonesentirely.However,itmetwithnoapparentsuccess.
为什么填encouraging而不填toencourage?
