Before we cross the road,we must stop and look both ways.对划线部分提问Before we cross the road划线()()we stop and look both ways

问题描述:

Before we cross the road,we must stop and look both ways.对划线部分提问Before we cross the road划线
()()we stop and look both ways

翻译一下就简单了,显然是问什么时间情况下要。。。

after what

When must