To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
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Ahave to know a great deal more than now about the social and economic
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Bhave to know a great deal more than they do now about the social and economical
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Cwould have to know a great deal more than they do now about the social and economical
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Dwould have to know a great deal more than they do now about the social and economic
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Ewould have to know a great deal more than now about the social and economic
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显示答案
正确答案: D