you should have thanked her before you left.I mean _____,but I can not find her
问题描述：
you should have thanked her before you left.I mean _____,but I can not find her
A to B to do为啥选a不选b啊,
答
do 在这里是及物动词请记住这一点,后面必须跟宾语,而A是省略回答省略了thank her
完整应该是i mean to thank her.但在I do not konw what to do中do后面就没宾语啊不好意思刚看到：I do not konw what to do这里的what 很特殊。Do的宾语就是what，宾语前置了是固搭疑问词+to do=疑问词+主语+can（或could 注意不能是其他情态动词）即 等于这个疑问词所引导的宾语从句，what不仅引导一个宾语从句，而且还是do得宾语，具有双重作用，英语中只有2个词有这样的左右，一个是what修饰事情，一个是who修饰人，以后这样的句子你会发现很多。I do not know what to reply 。I do not agree with what yousay意思是我不同意你的说法。希望我的回答对你有帮助相反I don not know what to do it，反而是错误的句子，it多余！