关于twice

According to surveys by the National Institute on Drug Abuse, about 20 percent of young 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）

(E) twice the number reported in the 1977 survey

twice 查字典只有副词一种词性，如果是这样，e中twice 修饰谁呢，它后面是名词呀

说不清楚，但是twice + the + 名词是对的，直接加名词是不对的。

请NN解释这个语法现象。谢谢先！

1.        In the 1980’s the rate of increase of the minority population of the United States was nearly twice as fast as the 1970’s.

(A) twice as fast as

(B) twice as fast as it was in

(C) twice what it was in

(D) two times faster than that of（C）

LES: twice +the +N

twice +what 都可以的