◎ 题干
It's common knowledge that black tea ________ in China more than 600 years ago.
[     ]
A. is invented    
B. was invented    
C. invents          
D. 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“It's common knowledge that black tea ________ in China more than 600 years ago.[ ]A. is invented B. was inventedC. inventsD. invented…”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。