问题
选择题
We ________ have bought so much food now that Suzie won't be with us for dinner.(2012·江西)
A．may not
B．needn't
C．can't
D．mustn't
答案
答案：B
考查情态动词。句意：既然Suzie不和我们一起吃晚饭，那我们就没有必要买这么多食物。根据 “now that Suzie won't be with us for dinner”可知答案，needn't have done表示“本没有必要做某事而实际上却做了”。