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单选题
12.U.S.News（ ）rankings of colleges since 1983. They are a very popular resource for students looking to apply to a university campus.
A
A.maintains
B
B. is maintaining
C
C. maintained
D
D. has been maintaining
答案解析
正确答案：D
解析：
根据第一句时间状语 since 1983 可知谓语动词应为完成时态；第二句用了一般现在时，主语 they 指代第一句的 rankings，可见该刊物如今依然会给大学进行排名。综上，maintain 这个动作开始于过去的某个时间并继续到现在，还可能会继续下去，符合现在完成进行时到使用条件。句意：《美国新闻与世界报道》自 1983 年以来一直保持给各大学进行排名。这些排名对于希望申请入读大学的学生来说，是一个非常受欢迎的参考资源。
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