The experiment requires more money than ___.为什么选has been put in?

问题描述:

The experiment requires more money than ___.为什么选has been put in?
more...than...在这里是什么用法啊?

more...than...意思是:比.多.
has been put in可以扩展为:the money has been put in the experiment,
所以,全句的意思就是:the experiment requires more money than the money has been put in it.比起已经投入的资金,此项试验仍需更多资金投入.