They ____have arrived at lunch time but their flight was delayed.C和D选项有什么区别,为什么C不对

题目

They ____have arrived at lunch time but their flight was delayed.C和D选项有什么区别,为什么C不对
A will B.must C.can D.should

答案

should have done/ought to have done（本应该做的事情没做.说话人语气中含有责备的意思.这是虚拟语气的一种表达）should'nt have done/ought'nt to have done(不该做的事情做了)can+have+过去分词,表示对过去或已经...