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    14．-I'm sure Tom will pass the exam．
    -I think so．He _________ in the library every night over the last two months．（　　）
    A．studiesB．studied
    C．is studyingD．has been studying

    分析 -我确信汤姆会通过考试．
    -我认为会通过．他在过去的两个月里每晚都在图书馆里学习．

    解答 答案：D 考查时态辨析．根据句中时间状语"over the last two months"，是指截止到现在的两个月里一直在学习，要用现在完成进行时态．A项是一般现在时态，指习惯性的动作；B项是一般过去时态，句中并没有过去的时间；C项是现在进行时态，强调现在正在发生的动作．

    点评 解答此类问题要了解各种时态的基本含义，并区别各种时态之间的差异，了解某些时态与一些特殊时间的固定用法，然后结合语境选择正确答案．

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