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 than作连词时,既有连接主句和分句的作用,又充当从句中的主语,其用法相当于定语从句中的关系代词。此处than在从句中指代money,故从句谓语动词用单数形式,C项has been put in正确。
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