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

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,