The experiment requries more money than_______
A. have been put in B. being put in
C. has been put in D. to be put in
为什么不能选B?
than引导比较分句,分句需要谓语动词。比较对应项在比较分句中作主语必须省略,所以than后直接后接谓语动词has been put in. 这是现代语法分析。如果按照传统语法分析,先行词money被比较级more修饰,后接定语从句时用关系代词than,than在从句中作主语,has been put in为从句的谓语。
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