问题
选择题
We should remember to save water resource and not to leave the water_____all the time.
A．to be running
B．to run
C．running
D．run
答案
答案：C
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, 故答案为C