[求助]OG11第4题（比较）及大全中相关问题请教

OG11第4题，

A survey by the national council of chunches showed that in 1986 there were 20736 female ministers,almost 9 percent of the nation'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 fingre for 1977; E: a number double that of 1977's

问题（1）C答案存在什么错误吗，如果有，为什么大全404（见下）的答案是（c），twice what it was in。难道是twice和bouble的区别吗

        (2)根据ETS的解释，B错在1977前面缺少IN，言外之意是twice as many as in 1977可以作为正确答案，但为什么这里的there were可以省略，而在大全22题（见下）（c）则为正确答案。

22.A recent national study of the public schools shows that there are now one microcomputer for every thirty-two pupils, four times as many than there were four years ago.
(A) there are now one microcomputer for every thirty-two pupils, four times as many than there were
(B) there is now one microcomputer for every thirty-two pupils, four times as many than there were
(C) there is now one microcomputer for every thirty-two pupils, four times as many as there were
(D) every thirty-two pupils now have one microcomputer, four times as many than there were
(E) every thirty-two pupils now has one microcomputer, four times as many as

404.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
(E) two times greater than