◎ 题干
You can't go to anyone's home in some countries unless you _________              
[     ]
A. invite            
B. were invited        
C. are invited
◎ 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“You can't go to anyone's home in some countries unless you _________[ ]A. invite B. were invited C. are invited…”主要考查了你对  【被动语态】【一般现在时】  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。