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2. The windows        for years. They are very dirty (clean)

窗户多年没清洗过,它们非常脏。

2. have not been cleaned后一句是一般现在时,加上前面一句中的for years ,表明本句要用现在完成时。主语为复数名词,因此助动词用have 

题目来源:高考英语组合训练多项选择+完成句子 > 组合训练53-54

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