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次の問題が理解できません。どなたかご教授ください。宜しくお願いします。
In the 1980's the rate of increase of the minority population of the United States was <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
(D)(E)は"times"でダメ
(B)かと思ったのですが、正解は(C)でした。
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