With the help of the collected money, subways can be built sooner and better, brings convenience to citizens.
A. as
B. what
C. who
D. which
网友回答
A. as
B. what
C. who
(答案→)D. which
解析：考查非限制性定语从句。本题考查的是非限制性定语从句。Which 指代先行词subways在句中做主语。B项不能引导定语从句，who的先行词必须是人。As有正如意思。故D正确。