we have说的是现在的情况，所以用现在完成时。而我们来到这里 这是肯定发生在过去的，所以用过去时。
你举的2个例子都是错的。
主句的时态永远要比从句新一个层次。
这个句子是对的：we had learnt quite a lot about it since we had come here.
英语时态问题We have learnt quite a lot about it since we came here
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