◎ 题干
Don't cross the road until the traffic lights ________ green.

A. turns
B. turn
C. turned
D. are turning
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Don't cross the road until the traffic lights ________ green. [ ]A. turns B. turn C. turned D. are turning …”主要考查了你对  【一般现在时】【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。