题目内容
Not until all the fish died in the river _________ how serious pollution was．
[ ]
A．did the villagers realize
B．the villagers realized
C．the villagers did realize
D．didn't the villagers realize
答案：A
解析：
解析：
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until用在否定句中，为了强调时间状语，常用倒装语序或强调结构.将否定副词not移到until的前面，主句的谓语动词由否定式变成肯定式，在主句之前加助动词，构成主谓倒装.答案为A.例如： Not until he was old and sick did the enemy set him free． 直到他老而又有病，敌人才把他释放. Not until all the students arrived did the teacher begin the class． 直到所有的学生都到了，老师才开始上课. |
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It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather.
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