[求助]GWD1－32

jojofgasw

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.

have to know a great deal more than now about the social and economic have to know a great deal more than they do now about the social and economical would have to know a great deal more than they do now about the social and economical would have to know a great deal more than they do now about the social and economic would have to know a great deal more than now about the social and economical

答案是E，可我觉得这个比较得补出they do, 因为比较得是知道的多少，为一个动作。另外，这个would的补出有必要吗？谢谢！

himba

No, the answer ought to be D. It is wrong to dispense with "they do", a ellipsis or a omission which would ruin the comparation. Besides, economic is more suitable for the logical sense of this sentence.