单选题
1、【2009.7】We ________ so much food last night. Only three guests turned up.
A.shouldn‘t order
B.didn‘t need order
C.needn‘t have ordered
D.mustn‘t have ordered
正确答案： C
答案解析： 本题考查情态动词的用法，needn‘t have done sth. 本没有必要做某事。