◎ 题干
When _____ the telephone _____ ?      
[     ]
A. did ; invent    
B. was ; invented    
C. was ; inventing  
D. does ; invent
◎ 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“When _____ the telephone _____ ?[ ]A. did ; inventB. was ; inventedC. was ; inventing D. does ; invent…”主要考查了你对  【被动语态】【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。