The research requires more money than ______.

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问题 The research requires more money than ______.

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

答案B

解析 因为钱是不可数名词,所以谓语动词应该用单数;由语义可知,这里应该用现在完成时的被动语态,故正确答案为B。
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