题目内容
-- Hurry up! The bus is coming.
-- Wait a minute. Don’t cross the street ____ the traffic lights are green.
A. after B. until
C. while D. since
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题目内容
-- Hurry up! The bus is coming.
-- Wait a minute. Don’t cross the street ____ the traffic lights are green.
A. after B. until
C. while D. since