885-s2-21

twice做程度状语.在这里是修饰reported.

类似的句子:He has twice the strength he had.

OG 49. The cameras of the Voyager II spacecraft detected six small, previously unseen moons circling Uranus,
which doubles to twelve the number of satellites now known as orbiting the distant planet
(A) which doubles to twelve the number of satellites now known as orbiting
(B) doubling to twelve the number of satellites now known to orbit
(C) which doubles to twelve the number of satellites now known in orbit around
(D) doubling to twelve the number of satellites now known as orbiting
(E) which doubles to twelve the number of satellites now known that orbit

doubling 修饰detect动作，

而这题doubling the number reported in the 1977 survey,doubling修饰used动作，应该也可以吧

这道题不是很懂，请斑竹指教 twice地用法， 我记得OG里面有一个6只鸟类迁徙，用的是doubling。。。

(1) double作动词时是主动语态(OG72);

(2)倍数的问题，如果强调动作的话，都用动词

(3)当要表达明确的两倍而又要用twice等词时一般用twice the number(=the number+ double)这类结构

(4)twice as much (many) as...

OG168:the same amount of acreage produces twice as many apples as it did in 1910;                                               

OG156:dirt roads cost twice as much to maintain as paved roads do