[求助]OG10-72

brick

72. The number of undergraduate degrees in engineering awarded by colleges and universities in the United States
                    increased by more than twice from 1978 to 1985.

(A)  increased by more than twice

(B)   increased more than two times

(C)  more than doubled 谓语？？？

(D)  was more than doubled

(E)   had more than doubled

答案是C，可是觉得C好像没有谓语啊。。。

tianpan

我也很困惑。这样看的话C中double就要作为动词了。
而字典里doubled也是一个单独的形容词。费解