1.A(交通灯变绿发生在过马路之前,所以过马路的时候 交通灯已经变绿了所以用完成时）
2.B(when的主从句时态是 主句一般现在从句将来或may,而且work是被完成,所以用被动）
3.A(疑问句tell后的从句 应用陈述句语序）
4.A（since 这里是既然的意思 其他不符合句义）
1、-Hey,jack!Don't cross the street until the trafficlight (
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