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
不同版本答案不同 到底选什么?为什么?
先把有economical的选项去掉.那么就剩A和D了.
A里面的more than后面部分和前面部分不平行. 而且主句部分应该用虚拟语态,所以要用would.
因此我觉得答案选D.
为什么要用虚拟语气呢?
有什么线索?
那答案看来确定是D了
谢谢了
现在我读着也觉得A别扭
呵呵
至于是不是虚拟语气我一点概念也没有
因为后面有一个more than now在,说明实际上现在不是这样的。所以用虚拟语气
其实GWD/prep上的选项略有不同,但是都没有拿have to/would have to当最后的判断点。
个人感觉此题考的还是more than的比较
如果they do被省略,把句子补足以后会发现,
demographers have to know a great deal more than they have to now about the social and economic.
但是句子原意是demogrphers have to know a great deal more than they know now.所以这里的know用do来替代,避免歧义。
我同意版主
这个题的主要考点不再would have to know和have to know上 通过其他考点选的
Alienx我有点不同的看法,我觉得在新PREP和GWD中对语气的考察是加强了,有那么几道题就是很明显的必须从语气角度考察。
这是我当初对这题的分析,着时伤脑筋:
A.
have to错应使用would have to,见C。此处的比较为状语比较,
不可省略主谓。见E
B.
have to错应使用would have to,见C。economical为cheap or not wasteful的意思,而economic
却relating to trade, industry, and the management of money,是考点,但应最后来考虑。
C. economical错见B。
D. would have toMingLiU","serif"; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma;">,表示一件应当做但没做的事,表示现在应该如何,但事实与之不符(或相反)。原题中有more than nowMingLiU","serif"; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma;">的重要提示,则一定要用虚拟表达“本应该”的意思。此处的比较为状语比较,
不可省略主谓。
E.
此处的比较为状语比较,
不可省略主谓。省略则变成了a great deal(information of other n.)和一个时间在比较。
open to discuss
我也同意语气是要考虑的
不过上面的解释都满好的 A 的have to more than have to错误 我现在倾向这个的判定了
2者结合一下
因为would have to know这里带虚拟用would 而they do now这里表现在的肯定 正好是完美的比较 将来和现在的比较
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