◎ 题干
—Who left the door open?
— Oh, sorry. I _____ the door.
A.ought to lockB.should lockC.ought to have lockedD.could lock
◎ 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“—Who left the door open?— Oh, sorry. I _____ the door.A.ought to lockB.should lockC.ought to have lockedD.could lock…”主要考查了你对  【虚拟语气】【情态动词】  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。