标题: 请教一道简单的语法题~ [打印本页] 作者: bycsscsq 时间: 2012-5-7 20:32 标题: 请教一道简单的语法题~ According to surveys by the National Institute on Drug Abuse, about 20 percent ofyoung adults used cocaine in 1979, doubling those reported in the 1977 survey. (A) doubling those reported in the 1977 survey (B) to double the number the 1977 survey reported (C) twice those the 1977 survey reported (D) twice as much as those reported in the 1977 survey (E) twice the number reported in the 1977 survey