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

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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

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
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

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
When must

after what

翻译一下就简单了,显然是问什么时间情况下要。。。