The pany ran into trouble when it tried to expand too quickly, was that it was short of money.
A. some of them
B. most of which
C. one of them
D. part of which
网友回答
A. some of them
B. most of which
C. one of them
(答案→)D. part of which
解析：考查非限制性定语从句：句意：公司在想迅速扩大的时候遇到困难，一部分是缺少资金。因为是定语从句，所以用关系代词，which，排除AC项，根据was可知答案为D项，如果选择B项，则要用were。选B。