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In the ninth grade at school,he got A's in all the subjects

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In the ninth grade at school,he got A's in all the subjects he took,which put him among the top ten students in the nation.
1.请问A's为什么要加's
2.请问这句which put him among the top ten students in the nation定语从句的先行词是什么?
In the ninth grade at school,he got A's in all the subjects
1很多A要加复数,这里A's是A的复数
2 现行词 是 “he got A's in all the subjects he took”