◎ 题干
Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.
A.it was inventB.was it inventedC.it was inventedD.it invented
◎ 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“Although the teacher had told Bob the history of telephone, Bob didn’t know when ____. A.it was inventB.was it inventedC.it was inventedD.it invented…”主要考查了你对  【宾语从句】  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。