It's ______(not allow) to talk loudly in a library.

问题描述:

It's ______(not allow) to talk loudly in a library.

not allowed
因为涉及到被动语态的问题所以allow应用过去分词
句意为:在图书馆禁止大声喧哗(直译为:在图书馆大声交谈是不被允许的)