题目内容
15．Dashan，who _______ crosstalk，the Chinese comedic tradition，for decades，wants to mix it up with the Western stand-up tradition．（ ）| A． | had been learning | B． | is learning | ||
| C． | will be learning | D． | has been learning |
分析 大山几十年来一直在学习中国的相声，一种中国的传统喜剧，他想要把它和西方的单口相声的传统结合起来．
解答 答案是D．本题考查时态；根据语境可知，几十年来大山一直在学习中国相声，而且还在学习中，所以用现在完成进行时，现在完成进行时表示在与现在相联系的一段时间内动作一直在进行，并且还在进行中，故答案选D．
点评 对时态的选择，要在把握时态的基本用法的基础上，根据具体语境和题干中的时间推断时态，同时关注特殊的结构．
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