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 在more…than…结构中,than有时可看作是关系代词,相当于than what…,than what在此相当于than the money that…。故排除B、D。又因主语为the experiment,排除A。故选C。
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