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--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
句意:窗户为什么这么脏?——因为我们有很久不打扫他们了。结合语境可知下文描述的是从过去一直持续到现在的动作,否定语气,故用现在完成时态否定形式,选B。
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