专四

单选题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

参考答案:B进入在线模考
【译文】这项研究所需资金比已经投入的资金要多。
【解析】考查比较级than后的形式。这里than后面省略了it(指代money),完整的形式应该是…than it has been put in.因此B为正确选项。