问题描述：
Which of the following is wrong?
A.Factories mustn't let out dirty water into rivers,must they?
B.The weatherman said that it may rain this afternoon.
C.You mustn't litter the floor.
D.You needn't water the flowers now
A.Factories mustn't let out dirty water into rivers,must they?
B.The weatherman said that it may rain this afternoon.
C.You mustn't litter the floor.
D.You needn't water the flowers now
问题解答：
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