请指教

lynnshen77

Q32:

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 economical

ans,c.me,d.

xizzhu

E 才是对的吧

pumpkin

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=79830&page=1

发贴标题请参考这个帖子。谢谢。