这道题如何判断选择?As it turned out to be a small house party,we ____

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这道题如何判断选择?
As it turned out to be a small house party,we ____ so formally.
A needn't dress B needn't have dressed
问下,然后这道题为什么选B,过去时态?是因为前面的turn加了ed么?
ps：加了ed应该表示过去式,证明,一个小聚会不用穿的很正规.这里表示这个聚会已经举办完了是么?

B.
这里的as是连词.
选B不是因为前面turned,而是,
情态动词+have+完成时动词done,
needn't have dressed so formally这里是本来不必穿得这么正式的.

这道题如何判断选择?As it turned out to be a small house party,we ____ As it turned out to be a small house party,we ___ so formall As it turned out to be a small house party,we＿＿＿so formally. As it turned out to be a small party,we ( ) so formally. As it turned out to be a small party,we____so formally as it turn out to be a small house party,we__so formally求大神帮如何翻译"We are going to have a small party at our house next We it turned out to be true the party turned out to be a failure,i would rather_it.A not the weather turned out to be fine,as we could expect. we were going out for a walk ____ it bagan to rain while as 英语阅读短文填词We are going to have a small party at our house n__