Don't you believe ____?A/that he did see a UFOB/if he see a UFOC/that did he see a UFOD/whether he did see a UFO

Don't you believe ____?A/that he did see a UFOB/if he see a UFOC/that did he see a UFOD/whether he did see a UFO
Don't you believe ____?
A/that he did see a UFO
B/if he see a UFO
C/that did he see a UFO
D/whether he did see a UFO

Don't you believe ____?A/that he did see a UFOB/if he see a UFOC/that did he see a UFOD/whether he did see a UFO
A/that he did see a UFO

A
did在这里是强调作用,可以翻译为"确实,的确"
难道你不相信他确实见到不明飞行物了吗?
而且后面只能跟that的句型,表示陈述

选A，意思是“你是否相信他确实看见了不明飞行物？”这里believe后跟宾语从句，从句中的did表示强调。不知我的分析对你有用否？

A