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