◎ 题干
You can't be ______ when you camp _____ an high altitude, where the air is thin.
[     ]
A. enough careful; at  
B. too careful; at  
C. careful enough; on  
D. too careful; on
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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 be ______ when you camp _____ an high altitude, where the air is thin. [ ]A. enough careful; at B. too careful; atC. careful enough; onD. too …”主要考查了你对  【形容词】【副词】【介词和介词短语】  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。