＃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

选项C为正确答案。 C 中的 ”what“ 是指代 ”the rate of increase of the minority population of the United States " ? 选项D 比较中用 ”that of " 也是对等的吧？