It would mean a lot to them to win.
可以。本句便是代词,作mean 的宾语。
a lot 是否用作代词的判断(词性判断):
1. eat a lot (及物动词后是代词)
2. talk a lot(不及物动词后是程度副词)
3. a lot of money(a lot of 后面的名词不特指时,是限定语)
4. a lot of my money(a lot of 后面的名词为特指时,是代词)
5. a lot of the money(同4,是代词)
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