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— Must we wear our school uniform this afternoon?
— No, you. All of us will go on an outing.
A.mustn't B.can'tC.needn'tD.couldn't
C

试题分析:mustn't禁止;can't不能,不可能;needn't不必;couldn't不能。句意:我们必须今天下午穿上我们的校服吗?——不,你们不必。我们都要去郊游。must的含义是必须一定,其否定形式mustn’t表示禁止的含义。故must的否定回答一般借助于needn’和don’t have to来构成,结合语境可知选C.
点评:must的否定形式是常考内容之一,结构比较固定,熟记即可。
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