A survey by the National Council of Churches showed that in 1986 there were 20,736 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 figure for 1977 E)a number double that of 1977's
The correct answer is D.
问题是double做什么？是谓语？时态为什么用原形？还有为什么用figure for 1977而不是figure of？ 如果句子改为twice as many as it was in 1977是否正确？ | 
