Whenthereisagreenlight,carsmaygoon.Whenthereisaredlight,carsmust(s).Theymustwait(u)theredlightchangestogreen
2021-12-04 55次 反馈错误 加入收藏 正确率 : 100%
题目内容：
When there is a green light,cars may go on.When there is a red light,cars must (s ).They must wait
(u ) the red light changestogreen
优质解答
stop,until
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