children should ______ when cross the road a.carefully B.be careful 为啥?
children should ______ when cross the road a.carefully B.be careful 为啥?
hurry up 明天用
hurry up 明天用
英语人气:882 ℃时间:2019-08-22 14:59:18
优质解答
careful是形容词,形容词前用be动词.
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