have ever/never seen

问题描述:

have ever/never seen
When I took the money from her grandfather,I looked back at the girl,who was giving me the prettiest,largest smile I have_____seen.
此处应该填EVER还是NEVER?
拜托下一位回答者可以给一个确切的回答OK吗?并请给出解释,谢谢

ever
我见过的