又一题

qiufeng1990

According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, （twice the number reported in the 1977 survey. ）
b) twice as many as those reported in the 1977 survey.
c) twice as much as those reported in the 1977 survey.

tongxun

twice 是介词。所以原划线部分the number 不能做其宾语。
人应该用many，所以我选B。

兄弟：给个答案吧。

tongxun

是20 percent of young adults 对the number ，而those的指带错误？

qiufeng1990

不愧是斑竹。是不是省略了 twice (as many as ) the number reported in .. survey

tongxun

我认为是这样的。等primefang从国外回来，我一定让他讨论本帖。