( ) Cars, buses and bikes stop when the traffic lights change to red. A can B may ——青夏教育精英家教网—

摘要：( ) Cars, buses and bikes stop when the traffic lights change to red. A can B may C must D need

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A. can 　　　　 B. may 　　　　　　 C. must 　　　　　　 D. need

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