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After he had finished his maths,he went on to do his physics

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After he had finished his maths,he went on to do his physics.做完数学后,他接着去做物理
1:为什么它使用过去完成时?had 而不是has
2:如果不加his 那么表达的是什么意思.
After he had finished his maths,he went on to do his physics
1.因为finish这个动作发生在went on 这个动作之前,所以要使用过去完成时.
2.加his表示强调是专属于“他的”,而不是其他人的.
再问: 如果我不加his 语法是否可行 意思是否完整。。。?