GWD1-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 economical 答案是E,但是我觉得A在逻辑意思表达上可能会更好。 理由1：第一个分句是To引导的目的状语，表明 demographers为了达到这个目的，不得不了解（have to learn）更多的determinants of fertility，而E则是would have to，虚拟语气。 理由2：social 和 economic 在意思上并列一致，“人口出生率在社会上的和经济上的决定性因素”，而E是economical，更强调“经济上节约的”，“节约的决定因素”逻辑意思不符。 不知道我这么理解有没有问题，还请大家帮助解答、指教：-）谢谢
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