please look carefully before you_____(cross)the street.请运用适当的形式填空并说明道理.

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pleaselookcarefullybeforeyou_____(cross)thestreet.请运用适当的形式填空并说明道理.pleaselookcarefullybeforeyou_____(

please look carefully before you_____(cross)the street.请运用适当的形式填空并说明道理.
please look carefully before you_____(cross)the street.请运用适当的形式填空并说明道理.

please look carefully before you_____(cross)the street.请运用适当的形式填空并说明道理.
cross
这里before是介词后面加从句,you_____(cross)the street.这一句子缺少了谓语,又考虑时态一般现在时比较恰当.故用cross.

cross 原型 一般现在时 本剧是起始句 没有别的时态,所以用原型