72. The number of undergraduate degrees in engineering awarded by colleges and universities in the United State 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
D. was more than doubled
E. had more than doubled
答案是C
我不懂的是這個句子的動詞到底是哪一個? doubled 嗎?
還是這裡有什麼省略句的句型用法
請各位高手指點