It is strange that he (should) have left withoutsaying doodb

It is strange that he (should) have left withoutsaying doodb It is strange that she should have done it. it is strange that he should have failed in this exam It is strange that he (should) have made a mistake.如果是虚拟语气sh It is strange that he should have gone away without telling It is strange that he should have come back so early . 如何翻译：it is strange that he should have gone away without tel 有人这样说：（It is strange that he (should) have made a mistake.他居 It's too strange that they should have left without saying g It is strange that she should have done it.句中should是情态动词吗? It is strange that he says so. It is strange that she---in the last exam A,should have fail