题目内容
—Can we run across the road now?
—No, we _ . We have to wait until the light turns green.
—No, we _ . We have to wait until the light turns green.
| A．needn't | B．mustn't | C．couldn't | D．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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