3.Not until the dedication of Yellowstone Park in the late nineteenth century ____ a national park.(A) the United States had\x0b(B) did the United States have\x0b(C) when the United States had\x0b(D) the United States having

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$3.Not until the dedication of Yellowstone Park in the late nineteenth century ____ a national park.(A) the United States had\x0b(B) did the United States have\x0b(C) when the United States had\x0b(D) the United States having$

3.Not until the dedication of Yellowstone Park in the late nineteenth century ____ a national park.(A) the United States had\x0b(B) did the United States have\x0b(C) when the United States had\x0b(D) the United States having
3.Not until the dedication of Yellowstone Park in the late nineteenth century ____ a national park.
(A) the United States had\x0b(B) did the United States have\x0b(C) when the United States had\x0b(D) the United States having

3.Not until the dedication of Yellowstone Park in the late nineteenth century ____ a national park.(A) the United States had\x0b(B) did the United States have\x0b(C) when the United States had\x0b(D) the United States having
b正确.当Not until位于句首时,句子要倒装.其结构为:Not until+从句/表时间的词+助动词+(主句)主语+谓语+.如:①Not until the teacher came in did the students stop talking.直到老师进来学生们才停止讲话.②Not until next week will the sports meet be held.直到下周才开运动会.

Not until the next morning ____. the teacher -----( not stop)-----(work)until midnight Not until the day before yesterday ---- raining. until...和not until... not ...until not.until. 请问是it was not until 1990s还是It was not until the 1990s Not until after the Olympics,the rates are too high. the opera is not over until the fat lady sings. Not until the end of last year 和Until the end of last year 的区别 It was____last week____ i knew the news A.until...that B.not until...when C.not until...that D.until...since答案是选C.not until用在什么句型?与until有什么不同.怎么区分? It was_____I read the letter____I knew she was married.A until.whenB not until.thatC until.thatD not until.when说明理由,谢谢 Do not cross the b____ until you come to it. They will not leave until the rain stops.什么意思? Sorry for my not checking the email until now. he solved the problem not until she told me The children___leave school __five school A.I,till B.don't,until C.didn't,until D.not,until 倒装：the little girl didi not feel happy until she saw her presentnot until 倒装