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 “more…than”为比较形式,其中than为关系代词,相当于than what。且前半句为一般现在时,所以答案为C。
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