before spring festival,people are busy ( )for it A.prepared B.preparing C.prepare D.to prepare要选哪个 为什么

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before spring festival,people are busy ( )for it A.prepared B.preparing C.prepare D.to prepare
要选哪个 为什么

选B.be busy doing固定搭配

选B
因为有一个结构 be busy (in) doing