题目内容：
—When the lights turn red, the traffic ______ stop.
A can B may C must D needn't
参考答案：
答案解析：
选择题：—When the lights turn red, the traffic ______ stop.
- 题目分类： 大学英语B级
- 题目类型：选择题
- 查看权限：VIP
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