If the tarffic light is red ,you ___ cross the road.It’svery dangerousA.don'tB.mustn'tC.needn’tD.wouldn't

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If the tarffic light is red ,you ___ cross the road.It’svery dangerous
A.don't
B.mustn't
C.needn’t
D.wouldn't

B,意思是“禁止”