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  3. [词汇与结构]—When the lights turn red, the traffic ______ stop.A can B may C must D n

[词汇与结构]—When the lights turn red, the traffic ______ stop.A can B may C must D n

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问题 [词汇与结构]—When the lights turn red, the traffic ______ stop.
选项 A can
B may
C must
D needn't
答案C
解析当灯变红，车辆必须停止。
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