a once

  • 网络表从前

a oncea once

a once

表从前

外研版高中英语必修四期末复习模块基础与提升... ... 19. A once 表从前。 9. B marking 是分词作结果状语,表示”标志着”。 ...

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The storm that had been a once-in-100-years event might become a once-in-50-years event, he said.

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