—Can we run across the road now?—No,we _ .We have to wait until the light turns green.为什么B—Can we run across the road now?—No,we _ .We have to wait until the light turns green.A.needn't B.mustn't C.couldn't D.shouldn't为什么选B,can'

—Can we run across the road now?—No,we _ .We have to wait until the light turns green.为什么B
—Can we run across the road now?
—No,we _ .We have to wait until the light turns green.
A.needn't B.mustn't C.couldn't D.shouldn't
为什么选B,can't行不行?

选B
给你解释一下
we can't是我们不能
而交通法规是义务.不是权利,所以必须遵守
所以用必须