—Can I walk across the road now, mum?
— No, you_______. You have to wait until the light turns green.
A．couldn'tB．shouldn'tC．mustn'tD．needn't
C 

本題考查情態(tài)動詞的用法。因為上句問的是“媽媽，現(xiàn)在我可以穿過馬路嗎？”下句用mustn’t來表示“不可以”，因為后面的句子說“你得等燈變綠了�！�
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