He found nothing except a card in the bag.完成反义疑问句.

问题描述:

He found nothing except a card in the bag.完成反义疑问句.
宾语含有否定词,请问反义疑问句该用什么形式?
答案给的did he?

问题补充:
答案给的did he?
请教英语水平较高者解释,谢谢.
He found nothing except a card in the bag.
=He didn'tfind anything exceptfor a card in the bag,
即是否定的:所以,did he?