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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.

正确答案: D

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GWD 1-32

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楼主
发表于 2004-12-14 23:48:00 | 只看该作者

GWD 1-32


To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.




  • have to know a great deal more than now about the social and economic

  • have to know a great deal more than they do now about the social and economical

  • would have to know a great deal more than they do now about the social and economical

  • would have to know a great deal more than they do now about the social and economic

  • would have to know a great deal more than now about the social and economical


  •    


    Why not B?


    沙发
    发表于 2004-12-15 00:06:00 | 只看该作者
    why not A?
    板凳
    发表于 2004-12-15 00:22:00 | 只看该作者
    在这个句子中没有可混淆的成分,所以无需补出they do,只需than now。既然是比较,就应有比较的双方,本句在比较将来与now,所以A中,have to know 与now同时态,这就不合适了。不知是否有道理,请考虑。
    地板
    发表于 2005-1-4 14:23:00 | 只看该作者

    But why E?

    How can E be the answer with "economical" in it?

    5#
    发表于 2005-1-4 15:51:00 | 只看该作者
    我覺得 would在這邊有表示 猜測不確定性 像是if的結果句的作用

    既然用would 所以後面補出 they do 以表明時態 now  

    如果時態一樣我覺得應該they do 可以省 像A這樣

    BCE的economical 意思不同  還請指教

    6#
    发表于 2005-1-5 13:58:00 | 只看该作者

    困惑中......

    是不是因为是推测才必须用would,不用补出they do也很清楚啊?生孩子当然是社会和经济(economical)上的决定因素啦......

    7#
    发表于 2005-1-12 11:58:00 | 只看该作者

    economical:节约的, 经济的

    economic:经济(上)的, 产供销的, 经济学的

    两者有区别阿

    8#
    发表于 2005-1-12 13:11:00 | 只看该作者

    困惑中,忘高人指点。。

    9#
    发表于 2005-4-19 12:11:00 | 只看该作者

    顶!


    我不明白为什么这里要用WOULD HAVE。请指教。

    10#
    发表于 2006-4-29 10:58:00 | 只看该作者

    我觉得would 表明的是一种虚拟假设,就是说,To develop more accurate population forecasts,那么demographers就应该怎么怎么样,所以用would have to 更好,但是我不明白为什么用economical 而不是economic, economic才能和social对应啊????


    请高人指点?!

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