单选题
25.
The research requires more money than______.
A、
have been put in
B、
has been put in
C、
being put in
D、
to be put in
【正确答案】
B
【答案解析】
本题考查比较状语从句的用法。than后面是省略了it，句子还原后为…than ithas been put in。此处it(被省略)做主语指代前面提到的money，且money为单数形式，答案是B。
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