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!
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.
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