Don't cross the road_____the traffic light turns green.A.before B.until C.when D.after

Don't cross the road_____the traffic light turns green.A.before B.until C.when D.after
Don't cross the road_____the traffic light turns green.
A.before B.until C.when D.after

Don't cross the road_____the traffic light turns green.A.before B.until C.when D.after
B.until

B
not....until 直到……才

B.until
not…until 直到……为止

B
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B
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B

A