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萌萌cxm1004
are 表明前面的名词（图书馆）一定是超过1个的liberaries
邮政邮政
It is very silent in the library .
微尘8313
填libraries 因为后面的谓语是are The libraries here are very quiet.这里的图书馆都很安静。
依钱钱512
It's very quiet in the library.
summer阿超
It is very quiet in the library.
我是不是很S
libraries 用复数形式，因为动词是are.
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