When there is a green light,cars may go on.When there is a red light,cars must (s ).They must wait

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
英语人气:199 ℃时间:2019-11-13 17:48:56
优质解答
stop,until
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