求教96年1月语法第12题

ArieschingUID: 182206

Noise in a room may be reduced by carpeting, draperies, and upholstered furniture,____ absorb sound.
a) which they all
b)of them all
c)all of which
d)of all which

答案是c

为什么选c呢？
这里两个分句之间没有连词连接，而all of which absorb sound中的which和前面的all of有什么关系呢？好像句子成分都不通的啊

quansa856UID: 2122649

选项以前“Noise in a room may be reduced by carpeting, draperies, and upholstered furniture”是主句，根据主句单一原则，后面的应该是从句。
根据题目，应选择c.
它考察的是非限制性定语从句，可以将其还原为：......,all of the carpeting, draperies, and upholstered furniture absorb sound.
which 指代“carpeting, draperies, and upholstered furniture”，而其他的选项均不符合题意。

头一次发贴讨论题目，经验不足，如有漏误，还请包涵：）

avexUID: 159089

同一楼上观点

n/数 + of +which的结构刚过的1t也有考到