Many strange new means of transport have been developed in our century the strangest of

问题补充：

Many strange new means of transport have been developed in our century, the strangest of being perhaps the hovercraft(气垫船).

A. which

B. them

C. that

D. it

答案：

A. which

(答案→)B. them

C. that

D. it

解析：考查独立主格结构。逗号后面不是一个完整的句子，如果分词与句子的主语没有关系，可以使用状语从句或者独立主格结构。独立主格结构相当于一个状语从句。句意：在我们国家很多新的交通方式已经发展出来了，最奇怪的是气垫船。故B正确。