most people remember when their birthday _____用is还是are?为什么?

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most people remember when their birthday _____用is还是are?为什么?
most people remember when their birthday _____用is还是are?为什么?

most people remember when their birthday _____用is还是are?为什么?
is,主语是他们的生日,可以看成是单数,意思是说每个人都记着每个人自己的生日.

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