[讨论]GWD31-14-32没搜到有讨论的

过氧化氢

To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

 

1. have to know a great deal more than now about the social and economic
2. have to know a great deal more than they do now about the social and economical
3. would have to know a great deal more than they do now about the social and economical
4. would have to know a great deal more than they do now about the social and economic
5. would have to know a great deal more than now about the social and economic

答案D，我选的是E，为什么they do不能省略？

cold2100

E变成would have to know a great deal 与now做比较了逻辑意思上不对。

比较从句中的主谓结构和主句的主谓结构相同可以省略,只保留作状语的介词短语或状语从句

now既不做状语也不是介词短语，省略了主语和谓语改变了比较对象！

看这题我花了1分多钟才选D，而且还对选的答案没有很大的信心...总是体会不到NN们的境界。

过氧化氢

now不作状语吗？

gonghao

比较的对象要对等

eg：sb do sth more than they did in the past 

但是部能说

sb do sth more than past

[此贴子已经被作者于2007-1-10 11:23:10编辑过]

过氧化氢

明白了，谢谢

过氧化氢

明白了，谢谢