题目内容
18．-Why，David，you look so tired!-Well，I an article and I must finish it tomorrow．（ ）
| A． | was writing | B． | will be writing | ||
| C． | have been writing | D． | have written |
分析 ---戴维，为什么你看起来这么累！
---嗯，我一直在写一篇文章，我明天必须完成．
解答 答案：C．根据you look so tired（你看起来这么累）和I must finish it tomorrow（我明天必须完成）可以知道写文章这个动作从过去一直到现在而且现在正在进行，应该用现在完成进行时，所以选择C．
点评 考查现在完成进行时．平时学习时要注意区分现在完成进行时和现在完成时态的被动语态，它们的结构分别是：
1．现在完成进行时havebeen doing
2．现在完成时态的被动语态havebeen done
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