Don't cross the road_____the traffic light turns green.A.before B.until C.when D.after
问题描述：
Don't cross the road_____the traffic light turns green.
A.before B.until C.when D.after
答
A
答
B
答
B
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答
B
not....until 直到……才
答
B.until
答
B.until
not…until 直到……为止
答
B
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