It is reported that in New Mexico, not until they graduate_______to leave high school.
问题描述：
It is reported that in New Mexico, not until they graduate_______to leave high school.
A. will teenagers be allowedB. teenagers will be allowed
答
A
Not until 主语+谓语 +倒装结构（助动词提前）+主语+ 谓语 结构（主句倒装,从句不倒装）