分类：教育/科学-学习帮助
问题：engish单选You____whenwasthebesttim 
单选You____when was the best time to get to Miss Green'birthday party.but you didn't.A.are supped to ask B.should have asked C.are able to ask D.should ask填词
回答：选D.should ask　
是虚拟语气，即，你本来是应该问的．