问题
选择题
As it turned out to be a small house party, we so formally.
A．needn’t dress up
B．did not need have dressed up
C．did not need to dress up
D．needn’t have dressed up
答案
答案：D
题目分析：考查情态动词和虚拟语气。句意：结果是一个小的家庭聚会，我们本可不必穿得这么正式。B项中的need不是情态动词；needn’t have done本不必做某事（实际上却做了）。故选D。