do not cross the street ____the traffic lights are green.填什么after until?

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donotcrossthestreet____thetrafficlightsaregreen.填什么afteruntil?donotcrossthestreet____thetrafficlight

do not cross the street ____the traffic lights are green.填什么after until?
do not cross the street ____the traffic lights are green.填什么
after until?

do not cross the street ____the traffic lights are green.填什么after until?
do not cross the street __until__the traffic lights are green.after until?
等到绿灯时再过马路.

Until

until

答案是until
望采纳.....