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the research requires more money than----

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the research requires more money than----
07年专业四级的语法题,没有详细解释,不懂.恳求各位能不吝赐教
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The research requires more money than____.
A. have been put in
B.has been put in
C. being put in
D. to be put in
给出的是B.
the research requires more money than----
The research requires more money than (that) has been put in.
句子省略了that
翻译:这项研究需要的经费比已经投入的经费要多。
意思是已经投入的经费还不够。
根据句意首先排除C和D
that has been put in 作为宾语从句,由于money不可数,所以用单数形式has,