英语高中语法题，请帮忙快点解答，谢谢~

这个是虚拟语气，I thought it strange that he __(should) not pass______ the last examination.
should省略了
句型： It’s necessary (natural, important, strange, a pity, no wonder ,suggested, requested，ordered，demanded, desired..) ＋that 之后以及名词order，suggestion, proposal, request, order等后的表语从句和同位语从句中，其谓语形式为：should+动词原形，should可省。
It’s necessary that he (should) go there himself．
It is a pity that he (should) be absent today.
My suggestion is that we (should) send someone to help him.
I make a proposal that we（should）hold a meeting next week.

it is strange that从句加should do 其中should可省
意思表示表示惊奇不相信
刚刚看外文片 正好也听到了这样的句型哈

should not pass ... (AUX... should) 省略

只说明 没通过考试 是发生在过去的事实 而不与thought构成过去的过去的关系
had not passed表示过去的过去 必须发生在thought之前

这个是虚拟语气。结构：it is strange that + 虚拟语气