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 As it tuned out to be a small house party, we ____ so formally.

A. needn’t dress up       B. couldn’t have dressed up

C. didn’t need dress up       D. needn’t have dressed up

 

【答案】

 B

may/might+have done一般只用于肯定句或否定句,不用于疑问句,表示对过去情况不肯定的推测,意为"也许已经……"。

 

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