When it es to giving his kids the education they deserve, the 51-year-old father knows he never _______ college without financial aid.A.could have attendedB.could attendC.had attendedD.should have attended
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A解析试题分析：考查虚拟语气。本题的虚拟语气是通过介词without（要不是，如果没有）表示出来的。根据句意可知是与过去事实相反的虚拟语气，故使用“情态动词+have done”。Could not have done不可能做了某事；should not have done本不应该做某事，实际上却做了。句意：如果没有经济援助，这位51岁的父亲知道他不可能完成大学教育。故A正确。考点：考查虚拟语气
点评：without虚拟语气的用法：1. 与现在事实相反：Without air, man couldn't exist on the earth.没有空气的话，人类将不能在地球上生存。谓语动词：would/could/might (not) do sth.2. 与过去事实相反：Without your help, I would have failed the exam last week.没有你帮助的话，我上周考试可能就通不过了。谓语动词：would/could/might (not) have done sth.3. 与将来事实相反：Without your ticket, I wouldn't be able to go to the concert tomorrow.要是没有你的票的话，我明天就不能去听音乐会了。谓语动词：would/could/might (not) do sth.