I can't remember ___i sent the book to A that B when C where D wh_知识解答

I can't remember ___i sent the book to A that B when C where D whom
请说明一下为什么

人气：699 ℃　时间：2024-05-16 21:00:56

解答

whom,这里用了sent to,空里填的应是对sent to的宾语的疑问词,所以用whom.