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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 have 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
翻译：
为了去推行更准确的人口播报，人口学家们本应该了解的比现在他们了解的更多。
句式：
To develop…, demographers would have to…more than now they do about…
思路：
Have to 和would have to; economic和economical
选项：
A. to develop more...表示未来的目的，同时more than now更说明了是未来和现在在做比较，而have to 同样表示的是一般现在时，时态错误;
B. to develop more...表示未来的目的，同时more than now更说明了是未来和现在在做比较，而have to 同样表示的是一般现在时，时态错误;economical表示节约的，逻辑语义错误;
C. economical表示节约的;
D. 正确;
E. 省略的话还原。前面用的would have to 那后面如果还原也应该变成would do.
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