曾经是中文里表过去时态的一个词.比如说I asked him翻成中文时可以翻译成我问过他/我曾经问过他。 in the past 用在这里不妥。比较通顺的表答应该为 I once asked him.
你说的可以，但也可以用现在完成时：I have asked him (about that).
应该是I had asked him（before）
