◎ 题干
----- The windows must have taken you quite a long time that day.
----- Right. They ______ for months.
A.haven’t been cleanedB.didn’t cleanC.hadn’t been cleanedD.haven’t cleaned
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“----- The windows must have taken you quite a long time that day. ----- Right. They ______ for months.A.haven’t been cleanedB.didn’t cleanC.hadn’t been cle…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。