请教GWD1－Q32，SC
请教一下各位NN：[font=Arial][size=12pt]GWD1-Q32:[/size][/font][font=Arial][size=12pt]
[/size][/font][font=PMingLiU][size=12pt]比較同類[/size][/font]
[font=Arial][size=12pt]To develop more accurate population forecasts, demographers [u]have to know a great deal more than now about the social and economic[/u] determinants of fertility.[/size][/font]
[list=a][*][font=Arial][size=12pt][color=#000000]have to know a great deal more than now about the social and economic[/color][/size][/font][*][font=Arial][size=12pt][color=#000000]have to know a great deal more than they do now about the social and economical[/color][/size][/font][*][font=Arial][size=12pt][color=#000000]would have to know a great deal more than they do now about the social and economical[/color][/size][/font][*][font=Arial][size=12pt][color=#000000]would have to know a great deal more than [color=red]they do[/color] now about the social and economic[/color][/size][/font][*][font=Arial][size=12pt][color=#000000]would have to know a great deal more than now about the social and economical[/color][/size][/font][/list][align=left]答案是D，我选了A。[/align]
[align=left]请问比较中一定要加上they do吗？还是A只是时态没用虚拟比D更生硬些？如果一定要加they do的话，什么情况下不可以省略呢？[/align]
[align=left]拜谢～～～～[/align]
[[i] 本帖最后由 arielcici 于 2007-5-15 00:57 编辑 [/i]] economical 有节俭的意思；正常语序they do和 倒装的do they都对；a中是deal和now做比较； 1只有当比较对象是主语时，才涉及到助动词的补出
2不同时间必须补，不同动作不能
3当会引起歧义时尽量补出助动词
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