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

When must

after what

翻译一下就简单了,显然是问什么时间情况下要。。。