问题
选择题
The buses, most of _______ were already full, were surrounded by an angry crowd.
A．that
B．it
C．them
D．which
答案
答案：D
考查定语从句。most of which were already full为非限制性定语从句，修饰 the buses.指大多数公共汽车都已经满了，选D。
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