we have learnt english for four terms.when we began to learn english这篇文章的全文

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we have learnt english for four terms.when we began to learn english这篇文章的全文

we have learnt english for four terms.when we began to learn english这篇文章的全文
we have learnt english for four terms.when we began to learn english
这篇文章的全文

we have learnt english for four terms.when we began to learn english这篇文章的全文
答案:C since 表示“自从,自以来”.引导时间状语从句,从句用一般过去时,主句用现在完成时.更上一层楼!请记得采纳,