--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：窗戶為什么這么臟？——因為我們有很久不打掃他們了。結(jié)合語境可知下文描述的是從過去一直持續(xù)到現(xiàn)在的動作，否定語氣，故用現(xiàn)在完成時態(tài)否定形式，選B。
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