children should ______ when cross the road a.carefully B.be careful 为啥?hurry up 明天用

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childrenshould______whencrosstheroada.carefullyB.becareful为啥?hurryup明天用childrenshould______whencross

children should ______ when cross the road a.carefully B.be careful 为啥?hurry up 明天用
children should ______ when cross the road a.carefully B.be careful 为啥?
hurry up 明天用

children should ______ when cross the road a.carefully B.be careful 为啥?hurry up 明天用
careful是形容词,形容词前用be动词.