How is the bolded word being used? The team has much work to do (before) the big game.a) subordinating conjunctionb) adverbc)preposition

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How is the bolded word being used? The team has much work to do (before) the big game.
a) subordinating conjunction
b) adverb
c)preposition

介词C,表示 在.之前.这支队在大赛之前有许多工作要做.