--Can we run across the road now? --No, ...

--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

B 【解析】试题分析：句意：-我现在可以过马路了吗？-不，不行。我们必须等到交通灯变绿。needn’t 不必，没有必要；mustn’t 禁止，不要；couldn’t不会，不能；shouldn’t不应该。根据句意可知，这里表示禁止、千万不要做的事，故应选B。考点：考查情态动词。

考点分析：

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