Question

The buses, _____ were already full, were surrounded by anxious people.

A．all of them

B．all of which

C．they all

D．all which

Answer 1

B

试题分析：句意：公共汽车，已经都满了，被焦急的人群包围。这里含有一个定语从句，分析句子结构可知，该空所填词用来引导定语从句，选B。