As it turned out to be a small house party,we＿＿＿so formally.这里为什么要填needn't have dresse...
问题描述：
As it turned out to be a small house party,we＿＿＿so formally.这里为什么要填needn't have dresse...
As it turned out to be a small house party,we＿＿＿so formally.这里为什么要填needn't have dressed up,而不是didn't need to dress up?
答
情态动词+完成式 表示对过去事情的推测
as it turned ot be “正如最后事实证明”