When a light turns red,we ____ croos the road .a.must b.mustn't c.can d.can't
问题描述：
When a light turns red,we ____ croos the road .a.must b.mustn't c.can d.can't
答
b.mustn't
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When a light turns red,we ____ croos the road .a.must b.mustn't c.can d.can't