The research requires more money than______.A、have been put inB、has been put in

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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

解析书名的谓语动词用单数形式，又由于本句是陈述一个事实，故用一般现在时态。因此B为答案。

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