单选题We should remember to&nbs

问题补充：

单选题Weshouldremembertosavewaterresourceandnottoleavethewater_____allthetime.A.to be runningB.to runC.runningD.run

答案：

C解析leave sth doing 让……处于某种状态, the water与run为主动关系, 再根据all the time, run应该为持续的经常性的动作, 故