once为副词,意为曾经、有一次,at one time。once 和 when从句都是时间状语,分别修饰谓语动词,二者之间互不修饰。我六岁的时候曾经...。once也可以放在中位状语位置:When I was six years old I once saw a magnificent picture in a book, called True Stories from Nature, about the primeval forest.
once为副词,意为曾经、有一次,at one time。once 和 when从句都是时间状语,分别修饰谓语动词,二者之间互不修饰。我六岁的时候曾经...。once也可以放在中位状语位置:When I was six years old I once saw a magnificent picture in a book, called True Stories from Nature, about the primeval forest.
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