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  3. U.S. News ________ rankings of colleges since 1983. They are a very popular resource for students looking to apply to a universi

U.S. News ________ rankings of colleges since 1983. They are a very popular resource for students looking to apply to a universi

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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 时态题。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继续延续下去的动作。“since+时间点”常用于完成时，表示某事于过去某一时间开始，并且现在仍在继续。因此，has been maintaining “一直在维持”为答案。A项maintains “维持”是用于一般现在时的动词的第三人称单数形式；B项is maintaining“正在维持”是现在进行时的用法；C项maintained“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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