急求OG4

A survey by the National Council of Churches showed that in 1986 there were 20,736 female minsters, almost 9 percent of the mation's clergy, twice as much as 1977.

A.  twice as much as 1977

B  twice as many as 1977

C  double what it was in 1977

D  double the figure for 1977

E  a number double that of 1977's

key

double 在这里时作动词用吗？是的话，前面也没有连词，那么这句话就有两个动词were, double,这样也可以吗？实在不解，请大家帮忙，谢谢。

我也有同样的问题,而且for 1977也不合理呀