急!求一道英语选择题解答

题目

急!求一道英语选择题解答
The side door was open and there was a sound of upraise voice from _____.The police listened carefully
A.indoors B.inside C.within D.where
答案是C
求解释为什么不是B?

答案

原因并不复杂：
inside、within都既可作介词、副词,又可作名词.这句话中是【名词】.
但是,在搭配上,inside前面需要【搭配定冠词the】,而【within则可以直接使用,不需要冠词】.例如：
the inside of the room 房间里面
The noise seems to be coming from within the building.吵闹声像是从楼房里传出来的.
【第二例句直接来自《牛津高阶英汉双解词典》】