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

窗戶(hù)多年沒(méi)清洗過(guò),它們非常臟。

2. have not been cleaned后一句是一般現(xiàn)在時(shí),加上前面一句中的for years ,表明本句要用現(xiàn)在完成時(shí)。主語(yǔ)為復(fù)數(shù)名詞,因此助動(dòng)詞用have 

題目來(lái)源:高考英語(yǔ)組合訓(xùn)練多項(xiàng)選擇+完成句子 > 組合訓(xùn)練53-54

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