问一个关于than引导的并列

xyredpoppy

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

在语法总结上看来的句子，问，do 是和would并列还是和know并列？

lijiahui0422

和know对应 would和do形式也不对应么~

xyredpoppy

恩，我也是这样认为的，不过总结里写的是和would并列.....