26. Venice is known by several names, one of _________ is the “Floating City” because it consists of 118 small islands connected by canals and bridges.
(A)them
(B)that
(C)which
(D)those

選項改法 :

26. Venice is known by several names, one of _________ is the“Floating City”

      because it consists of 118 small islands connected by canals and bridges.

(A)them  -->  Venice is known by several names, and one of them is the...

 (B)that  --> Venice is known by several names that one of them is the...

 (C)which  --> 代名詞之前有量詞(two, several,...)，只能用which(事物)跟whom(人)。

 (D)those  --> Venice is known by several names, and one of those names is

     the...

*(A)、(C)畫底線處相等 --> them = those name

..............................................

Venice is known by several names, one of  which is the “Floating City” because it consists of 118 small islands connected by canals and bridges. 
(A)them 
(B)that 
(C)which 
(D)those

這裡的which 是做關代。 one of which=one of several  names=whose one

Venice is known by several names one of  which is the “Floating City 在眾多的名字之一是 漂浮中的城市。

這句可以說是和 Venice is known by several names whose one  is the “Floating City 同樣

（用作關係代名詞）那個人的，那些人的；他（她）們；他（她）們的

Chopin, whose works are world-famous, composed some of his music in this room . 蕭邦的音樂作品舉世聞名，其中的一部分就是在這間屋子裡創作的。

He utterly despised his school, the toilets of which were never cleaned. 這個which 替是school的關代

是說  the toilets of his school=his school whose toilets. 學校的廁所從沒被清理。

http://zh.exam.wikia.com/wiki/Whose%E5%92%8Cof_which?variant=zh-tw

引用這網址的句子。自行看一下比較。
 

Of which固然較麻煩，因為它有其他用處，而且又難用。但which也不是沒缺點啊！比較一下下列三組句子吧：

The house, whose colour was red, was 100 years old.
The dogwhose owner was Ted ran away. 這狗的主人是 ted ，這狗逃跑了。
The priceless cup, whose lid was blue, was stolen yesterday.
The apple tree whose fruits had been picked was chopped down.

The house, the colour of which was red, was 100 years old.
The dog the owner of which was Ted ran away.這狗(狗的主人是ted) 逃跑了。(實際上意思有些差，但這差別是又好像根據文化、習慣來的……所以應該是沒差吧)
The priceless cup, the lid of which was missing, was stolen yesterday.
The apple tree the fruits of which had been picked was chopped down.

http://zh.exam.wikia.com/wiki/Whose%E5%92%8Cof_which?variant=zh-tw

of which 是固定用法。就這樣所以是 of which

Venice威尼斯
canal(s)運河；水道 bridge(s)橋樑 

威尼斯有幾個名字，其中一個是“浮動城市”，因為它由118個由運河和橋樑相連的小島組成。