U.S. News ______ rankings of colleges since 1983. They are a very popular resour

游客2023-10-28 82

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

解析现在完成进行时表示一个从过去某时开始发生，一直延续到现在并可能延续下去的动作。“since+时间点”常与完成时连用，表示某事于过去某一时间开始，并且现在仍在继续。因此D项has been maintaining“一直在维持”为答案。A项“维持”，是一般现在时的第三人称单数形式；B项“正在维持”，是现在进行时的用法；C项“曾维持”，是一般过去时的用法。根据完成时的标志词“since+时间点”，排除A、B和C。

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