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—Can we run across the road now?
—No, we _     . We have to wait until the light turns green.
A.needn'tB.mustn'tC.couldn'tD.shouldn't
B
needn't不必; mustn't 禁止,一定不;couldn't不能;shouldn't不应该。句意:我们现在能穿过马路吗?——不,我们一定不要。我们必须等到红灯亮时。情态动词之间最大的区别就是表示语气的不同,结合语境可知选B。
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