标题: 求解OG16 SC第61题 [打印本页] 作者: Hazzy 时间: 2016-1-26 20:26 标题: 求解OG16 SC第61题 原题如下：
To develop more accurate population forecasts，demographers have to know a great deal more than now about the social and economic determinants of fertility.
答案中说这个时态要用would have to know，想不太通....
求各位大神解答 蟹蟹~~ 作者: Hazzy 时间: 2016-1-29 18:28
为什么没人TAT 桑心~~~作者: ztc199201290411 时间: 2016-1-30 23:31
我觉得前面说了to develop，所以主句就要用将来时就用will，这里可能有点虚拟语态的感觉，所以用would。不知道这样解释对不对作者: acc123 时间: 2016-5-30 14:41
个人觉得此题不一定必然使用虚拟语气，不过A项的比较结构不正确，另外考察用词economic and economical。综合选择D：would have to know a great deal more than they do now about the social and economic作者: Chris_Xianer 时间: 2017-11-5 18:12
楼主楼主！我在Manhattan Prep的forum里找到了Ron大神的回复：
either "have to..." or "would have to..." (or "will have to...", which doesn't appear in the choices) could work here.
"have to ..."
--> no implication about whether this is likely; just a matter-of-fact statement about what they need.
"would have to..."
--> implies that this is an unlikely (or even impossible) scenario.
"will have to..."
--> implies that this will be at issue sometime in the future. doesn't imply anything about whether demographers will be able to achieve this kind of knowledge, but says that they'll need it (and so will fail in their efforts if they don't succeed in obtaining the knowledge).
if you change "economical" to "economic" in choice (b), you would have another viable option.
出处：https://www.manhattanprep.com/gmat/forums/forecast-t7862-15.html
也就是说这道题里的have to/would have to不是一个真正的split，这两种表达意思上有轻微的不同，但是这里我们无法判断原意是哪个，所以两个都行。事实上这道题确实不需要用这个来判断出正确选项
蟹蟹~~