The research requires more money than ______.[2007]A、have been put inB、has been

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问题 The research requires more money than ______.[2007]

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

答案 B

解析本句中连词than后面省略了主语it，此处it指代的是前面提到的money，因此要求后面的动词用单数；从语义上来看，这里是比较需要的钱和已经投入的钱，故用现在完成式has been put in，故B正确。

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