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.作者: tongxun 时间: 2002-9-24 23:41
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。作者: tongxun 时间: 2002-9-24 23:47
是20 percent of young adults 对the number ，而those的指带错误？作者: qiufeng1990 时间: 2002-9-25 00:01
不愧是斑竹。是不是省略了 twice (as many as ) the number reported in .. survey作者: tongxun 时间: 2002-9-25 00:05
我认为是这样的。等primefang从国外回来，我一定让他讨论本帖。
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