题目内容
16．-Why don't you leave school？It's already eight o'clock．-Because I ____________ my homework yet．（ ）
| A． | don't finish | B． | wasn't finishing | ||
| C． | won't finish | D． | haven't finished |
分析 -你为什么不离开学校？已经八点钟了．-因为我还没有完成作业．
解答 答案：D．根据关键词yet可知，本句是现在完成时态，强调对现在的影响或结果；其构成为：have/has+过去分词，主语I是第一人称，助动词用have，其否定形式在助动词后面加not，finish的过去分词为finished，故选D．
点评 本题考查动词的时态，解决此类问题的关键是根据标志词和时间状语来确定动词的形式，在不同的语言环境中达到熟练掌握的目的．
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