U.S. News _____ rankings of colleges since 1983. They are a very popular resourc

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问题 U.S. News _____ rankings of colleges since 1983. They are a very popular resource for students looking to apply to a university campus.

选项 A、maintains
B、is maintaining
C、maintained
D、has been maintaining

答案 D

解析时间状语since 1983提示第一句谓语动词应为完成时态；第二句用了一般现在时，可见该刊物如今依然会给大学进行排名。可见maintain这个动作开始于过去某个时间，持续到现在，还可能会继续下去，故D项为答案。

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