题目内容

﹣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

试题分析: 句意：为什么窗户那么脏？因为我们很长时间没清洁了。for a long time很长时间，for加时间表一段时间，用于现在完成时，窗户脏的原因是没有清洁，故选B.
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