U.S. News______rankings of colleges since 1983. They are a very popular resource

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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. (2018-12)

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

答案 D

解析动词时态。根据题干中的时间状语since 1983，可知本题使用完成体；现在完成进行体，表示动作或状态从过去某时开始，继续到现在，可能继续下去，(也可能刚刚结束)，强调对于现在的影响，带有进行体的持续性、暂时性、未完成性的特点。故本题答案为D。

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