We ______ careful when we are walking across the road.There are too many vehicles now.
A. can be B. may be C. must be
科目：初中英語 來源：山西省中考真題 題型：單選題
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科目：初中英語 來源： 題型：
We ______ careful when we are walking across the road.There are too many vehicles now.
A. can be B. may be C. must be
科目：初中英語 來源：2008年山西省初中畢業升學統一考試、英語試卷 題型：023
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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