The experiment requires more money than ______.[2002]
A、
have been put in
B、
being put in
C、
has been put in
D、
to be put in
【正确答案】
C
【答案解析】
解析：句中than引导比较状语从句，从句中的主语被省略，另外money为不可数名词，故用has been put in，选项C正确。
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