The experiment requires more money than______.

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问题 The experiment requires more money than______.

选项 A、have been put in
B、being put in
C、has been put in
D、to be put in

答案C

解析 省略用法。本句中than引导比较状语从句,从句中的主语被省略,另外,“投入了的经费”要使用完成式,money为不可数名词,故本题has been put in为正确答案。类似用法的句子如:There were more people than was expected./We were kept waiting longer than was absolutely necessary.
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