The police have said that this situation as soon as possible.
A. must put an end
B. should be put an end
C. must be put an end to
D. should put an end to
网友回答
A. must put an end
(答案→)B. should be put an end
C. must be put an end to
D. should put an end to
解析：考查情态动词。put an end to是固定短语,to不能省略，根据语境应该用被动语气。