187. (32525-!-item-!-188;#058&007080) (GWD-1-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. 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
我选的是A,答案为D,为什么呢,would家在这里是什么意思呢?
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