.---Well,I found this.I think it must be yours.---Where_____it.A.had you found B.did you find

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.---Well,I found this.I think it must be yours.---Where_____it.A.had you found B.did you find

B 这里不能选A 这是对他在哪找到书的提问没强调对现在有什么影响,只是问书在哪找的,所以用过去式就行了