Question

Life in the 21 st century is much better than_____ used to b

Life in the 21 st century is much better than_____ used to be. A．that B．it C．what D．one

Answer 1

B

考察it做形式主语。本题中it代替前文Life in the 21 st century做下文形式主语，其它选项没有这个用法，故选B。