In some countries,tea ____ with milk and sugar.a.is served b.serves答案那写着是a 那为什么b不行呢?请大家解释一下.

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In some countries,tea ____ with milk and sugar.
a.is served b.serves
答案那写着是a 那为什么b不行呢?请大家解释一下.

茶是被人提供,所以要用被动语态