单选题 You ______ have brought your umbrella for we are going by car.
[A] won't [B] mustn't [C] needn't [D] don't

【正确答案】 C

【答案解析】[解析] 考查情态动词用法。由句意不难看出，这里是指“不必要做某事(而事实上已经做了)”，有此义的选项是needn't。其余三项都没有这一意义：won't表示将来(“不会”)或者意愿(“不愿”)；mustn't表示的是强烈的“禁止，不准”；don't则只表示现在时态，其后不能再跟完成时态。