I have studied English or three years since I had come here.(改错)

I have studied English or three years since I had come here.(改错)

题目
I have studied English or three years since I had come here.(改错)
答案
I have studied English for three years since I (had come)(把这两个词改为came) here.
自从我来到这里,我已经学了三年英语了.
主句为现在完成时态,since引导的时间状语从句应该为一般过去时,had come应该改为came.
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