The experiment on the monkey to test the new drug, which has already been advertised on TV, requires

The experiment on the monkey to test the new drug, which has already been advertised on TV, requires more money than ________．

A.have been put in

B.being put in

C.has been put in

D.to be put in

答案及解析： C

解析：

试题分析：本题为语法题，考查more…than这一结构的用法。详细

解答：在more…than这一结构中，than后面应跟动词原形，又因为主语是the experiment，所以谓语用单数，故选项C为正确答案。