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To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility. A. have to know a great deal more than now about the social and economic B. have to know a great deal more than they do now about the social and economical C. would hav to know a great deal more than they do now about the social and economical D. would have to know a great deal more than they do now about the social and economic E. would have to know a great deal more than now about the social and economic D correct. Why not A?
[此贴子已经被作者于2009/9/4 2:18:17编辑过] | 
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发表于 2009-9-4 02:17:00
