题目内容
15．-Why didn't you leave school？It's already eight o'clock．-Because I my homework yet．（ ）
| A． | wasn't finishing | B． | wouldn't finish | ||
| C． | haven't finished | D． | wasn't finished |
分析 -你为什么没离开学校？现在已经八点了．
-因为我还没完成我的作业．
解答 答案：C 根据副词yet可知，要用现在完成时态；现在完成时态的结构为have/has+动词的过去分词．主语是第一人称，助动词用have，故选C．
点评 判断动词的时态，要结合句子的语境及其引导词去判断动词存在的状态．此题already和yet都是现在完成时态的标志词．
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