◎ 题干
Who _____ the key to the door _____ by?
[     ]
A. was; found out
B. was; found
C. was; founded
D. did; discover
◎ 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 _____the key to the door _____by?[ ]A. was; found outB. was; foundC. was; foundedD. did; discover…”主要考查了你对  【分词】【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。