在线名词解释大全
专业、全面、易懂的全领域名词百科
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详细
S.News______rankingsofcollegessince1983.Theyareaverypopularresourceforstudentslookingtoapplytoauniversitycampus.
题型：单选题
选项
A.
maintains
B.
is maintaining
C.
maintained
D.
has been maintaining
正确答案：D