题目内容

—Hurry up! The bus is coming.
—Wait a minute. Don’t cross the street _______ the traffic lights are green.
A．untilB．afterC．whileD．since
A
not...until…是“直到...才”表示直到某一时间,某一行为才发生,而在之前该行为并没有发生。根据句意应是“不要过马路直到交通灯是绿色的”，故选A.
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