再来一道给力GMAT语法题 求解

zlljolie

白勇语法关于比较从句的省略：
有这么一条：“.比较从句的主语和位于与主句的主语和谓语相同时，可以全部省去，常常保留作状语的介词短语或状语从句。”
但是有一题PREP：
原题：To develop more accurate population forecasts, demographers have to know a great deal more than they do now about the social and economic determinants of fertility.
have to know a great deal more than now about the social and economic（X）这个不能算是上述所说的那种省略吗？

牛人，快来指教( ⊙ o ⊙ )啊！

have to know a great deal more than now about the social and economic（X）这个不能算是上述所说的那种省略吗？

牛人，快来指教( ⊙ o ⊙ )啊！