2. 学历提升
  3. —When the lights turn red, the traffic ______ stop.

—When the lights turn red, the traffic ______ stop.

admin2020-12-24  21
问题 —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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