U.S.News____________rankingsofcollegessince1983.Theyareaverypopularresourceforstudentslookingtoapplytouniversitycampus.-查字典考试网

U.S.News____________rankingsofcollegessince1983.Theyareaverypopularresourceforstudentslookingtoapplytouniversitycampus.

A、maintains
B、ismaintaining
C、maintained
D、hasbeenmaintaining

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