More and more people have realized we won't have cleaner water to drink unless something ______

soon.[ ]

A. was done      

B. will be done    

C. to be done    

D. is done

出现下列哪种情况，油品可以作回罐处理？（）

A.加油站发电用油

B.加油枪自校用油

C.职能部门车辆用油

D.维修加油枪用油