这道题包含could have+done跟虚拟语气两个语法点...主语+could have/has done(动词的过去分词),意思是：这个人过去本应该做什么,而实际上没做.所以你给的题目前半小句的意思是：我之前应该早一点来的,我们看得出是完成时.然后后小句出现了个but的转折,直接看出意思是：但是我在半路遇到了一个朋友.（虚拟语气中前句是完成时,后句必须用过去时.前句是过去时,后句用现在时.前句用过去完成时,后句用完成时.）所以综上所述：应该选A.另外,从这道题中看得出你的虚拟语气语法有待加强,还有时态的选择你也有些摇摆不定.大多数时侯虚拟语气你不必记得太复杂,就按照括我给你括号里的内容就好了.
求解英语单选：I could have come a little earlier,but I ______ a fri
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单选：＿＿ I wrote a little poem,I confidently placed