高中英语 虚拟语气相关

问题描述:

高中英语 虚拟语气相关
It's strange that Mr Black ( ) nothingabout that matter.
A should know Bwould knowC had knowD knew
答案是A 解析说的是因为虚拟语气 但那里体现虚拟了啊?

it's strange that后用虚拟语气、固定用法.