I have read this book请问它和I had read this book有区别吗?

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I have read this book请问它和I had read this book有区别吗?
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I have read this book请问它和I had read this book有区别吗?
I have read this book
请问它和I had read this book有区别吗?

I have read this book请问它和I had read this book有区别吗?
一个是现在完成时
一个是过去完成时
时间上来说
HAD要完成的更早一点.

上一句是说我“现在”读过这本书
下一句是我“过去”读过这本书。
时间不一样。

have done是现在完成时,had done是过去完成时,两种时态的区别楼主可以查语法书