The experiment requires more money than________.

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问题 The experiment requires more money than________.

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

答案A

解析 本题考查时态。put in意为“花费,投入(时间或精力)”。根据more money than(比……更多的钱)可知,需要的钱比投入的多。投入发生在过去,对现在产生了影响,且the money和put in之间为被动关系,空格处所填应为现在完成时态的被动语态,故答案为A项。has been put in可以扩展为the money which has been put in the experiment。
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