◎ 题干
A person with good manners never laughs            people when they are            trouble.
[     ]
A.on ; in
B.in ; at
C.on ; at
D.at ; in
◎ 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“A person with good manners never laughspeople when they aretrouble. [ ]A.on ; in B.in ; at C.on ; at D.at ; in …”主要考查了你对  【介词】  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。