◎ 题干
We ______ careful when we are walking across the road. There are too many vehicles now.

[     ]

A. can be
B. may be
C. must be
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“We ______ careful when we are walking across the road. There are too many vehicles now. [ ]A. can be B. may be C. must be …”主要考查了你对  【情态动词】  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。