◎ 题干
He stood up, _____ the large door and looked outside. There on the ground lay a white dog.
[     ]
A. opens
B. opened
C. opening
D. having opened
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“He stood up, _____the large door and looked outside. There on the ground lay a white dog. [ ]A. opens B. opened C. opening D. having opened …”主要考查了你对  【动词的过去式】【一般过去时】  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。