--Why are the windows so dirty? --Because we_________them for a long time. A. have cleaned B. haven'...
2023-02-14 11:30:23 56次 2013年初中毕业升学考试（福建漳州卷）英语（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
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
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