问题
选择题
The buses, ________ were already full, were surrounded by an angry crowd.
A．most of them
B．which most
C．most of which
D．that most
答案
答案：C
题目分析：考查非限制性定语从句。根据逗号判断，句子是非限制性定语从句，most of...意为“......的大多数”，排除B、D；A项不能引导从句，如果在逗号后添加and，则句子变成两个并列的分句。目前来看，句子是主从复合句，most of which指代大多数公交车，故选C。