问题补充:
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
答案:
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。