During Spring Festival,people in China dress themselves

During Spring Festival,people in China dress themselves ___ their best clothes.A.up B.on
During Spring Festival,people in China dress themselves ___ their best clothes.
A.up B.on C.on with D.up in

D
dress up in
是固定搭配,用什么打扮
dress up as 装扮成什么
因为dress 后面是不能直接跟衣服的,只能跟人,因此,这个句子,还可以等于,dress up in the best clothes for themselves