52、As it turned out to be a small house party, we ( )so formally.

　 need not have dressed up

　 must not have dressed up

　 did not need to dress up

　 must not dress up

正确答案：A

解析：

解析: 【考点】情态动词与虚拟语气。need not have done表示与过去事实相反，意思是“本不需做某事的”。did not need to dress up描述的是真实的过去事件，但在意思上与此句不符。

[译文]原来只是一场小型家庭聚会，我们本不需穿得这么正式的。

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