题目内容

---- Hurry up ! The bus is coming .
----- Wait a minute. Don’t cross the street_________ the traffic lights are green.
A．sinceB．afterC．whileD．until
D

试题分析: 句意：快点，公交车来了。等一下，绿灯亮了再过马路。since自从，after     在……之后，while当……的时候，until直到。not unitl直到……才，固定用法，故选D.
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