◎ 题干
---What _________ to the building?   ---It _________ when all the people were sleeping.
A.has happened; was broken inB.was happening; was broken down
C.was happened; broke into D.happened; was broken into
◎ 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“ ---What _________ to the building? ---It _________ when all the people were sleeping. A.has happened; was broken inB.was happening; was broken down C.was ha…”主要考查了你对  【实义动词的单数第三人称形式】【实义动词】【动词短语】  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。