问题补充：
We a word unless she asks us.
A. didn’t dare say; to
B. don’t dare to say; to
C. dared not say; to say
D. dare not to say; to say
答案：
A. didn’t dare say; to
(答案→)B. don’t dare to say; to
C. dared not say; to say
D. dare not to say; to say
解析：考查dare的用法和不定式的用法：句意：我们不敢说话，除非她让我们说。因为后面是asks是一般现在时，排除AC。Dare做为情态动词的时候，否定是dare，后面接动词原形，所以D不对，B项的dare是实意动词，dare的否定是don’t dare，后面接动词不定式，第二空是省略的不定式，ask sb to后面省略了say …,选B。
