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She must be at least forty.请问其中的at least是副词,还是介词短语,用来修饰哪个词?

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She must be at least forty.请问其中的at least是副词,还是介词短语,用来修饰哪个词?
at least如果是副词,但副词只修饰动词(系V除外),adv,adj,整个句子,没听说副词可以修饰名词.
但为什么有些在线词典说at least是副词?
She must be at least forty.请问其中的at least是副词,还是介词短语,用来修饰哪个词?
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