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

问题描述:

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.