what you have learned about a subject 这句话怎么理解为什么加上have lear

what you have learned about a subject 这句话怎么理解为什么加上have learn为什么加ed

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vivienleigh 花朵

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Learned 是 learn 的过去式和过去分词的形式之一.在这里构成现在完成时.整句的意思是“你已经在这个科目中学到了什么?”

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