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        1. ﹣Why are the windows so dirty?
          ﹣Because we __________ them for a long time.
          A. have cleaned         B. haven’t cleaned         C. didn’t clean
          B

          試題分析: 句意:為什么窗戶那么臟?因?yàn)槲覀兒荛L(zhǎng)時(shí)間沒(méi)清潔了。for a long time很長(zhǎng)時(shí)間,for加時(shí)間表一段時(shí)間,用于現(xiàn)在完成時(shí),窗戶臟的原因是沒(méi)有清潔,故選B.
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