答案：B

题目分析：考查虚拟语气：从句是Had I known her name，相当于if I had known her name，是和过去相反的虚拟语气，主句应该是would have done，句意：我要是知道她的名字，我就会邀请她吃晚饭了。选B。

点评：if的虚拟语气非常重要，简要概括如下：1、表示与现 在事实相反的情况，从句：If主语+过去时(Be动词用were)；主句：主语+should/would/could/might+do：　2、表示与过去事实相反的情况，从句：If主语+had+done；主句：主语+should/would/could/might+have done　3、表示对将来情况的主观推测，从句：①if+主语+were to do②if+主语+should+do ③if+主语+did（动词过去式）/were ；主句：主语+should/would/could/might+do