at least one 请问at least不应该是个副词吗 那怎么可以修饰名词one呢

at least是介词短语,相当于副词,它与about, over, nearly一样,可以作程度副词用关键的是,forty不是名词,而是表示年龄的数词. 如: She must be at least forty, She is about forty. She must be over forty. She is under forty. She is at most forty

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