It is strange that he had made a mistake.奇怪的是他犯了一个错误.这是一个陈述句,就是陈述一个事实：他犯了错误让人有点奇怪.It is strange that he (should) have made a mistake.他居然犯了一个错误,真令人奇怪...
that从句什么时候加should
It is strange that he had made a mistake.奇怪的是他犯了一个错误.这是一个陈述句,就是陈述一个事实：他犯了错误让人有点奇怪.It is strange that he (should) have made a mistake.他居然犯了一个错误,真令人奇怪...