The buses, were already full, were surrounded by an angry crowd.A. most of themB. most of

The buses, were already full, were surrounded by an angry crowd.
A. most of them
B. most of which
C. which most
D. that most

A. most of them(答案→)B. most of whichC. which mostD. that most解析：考查引导定语从句关系词与介词的用法区别。句意：那些大部分已经满的公共汽车被一群愤怒的人包围着。先行词是the buses,后面要用关系词which来指代，表示大部分就用most of which，C 和D结构不正确；如果空格后面与主句并列，就可以考虑；故B正确。

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