﹣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時(shí)間沒清潔了。for a long time很長時(shí)間，for加時(shí)間表一段時(shí)間，用于現(xiàn)在完成時(shí)，窗戶臟的原因是沒有清潔，故選B.
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