you should have thanked her before you left.I meant____,but

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you should have thanked her before you left.I meant____,but when I was leaving I could
you should have thanked her before you left.
I meant____,but when I was leaving I couldn't find her anywhere.
A to do B to C doing D doing so
为什么不能选A?

B,这是动词不定式的省略形式,后面的do sth一起省略,这里必须要用mean to do而不是doing（前者是“打算做某事”,后者“意思是,意味着”,意思不对）
句子意思是“你应在走之前感谢她
我打算这样做,但是当我要离开时去找不到她”
补充：A的do是一个实义动词,需要加宾语sth的,动词不定式的省略是到to为止的（有时表示过去要加上have）,后面的do sth要一起省

you should have thanked her before you left.I meant____,but you should have thanked her before you left.I mean _____,but 1.—You should have thanked her before you left. -You should have thanked her before you left. you should have thanked her before you left. —You should have thanked her before she left. 英语试卷.求改错!111.— You should have thanked her before you left.— I should have insisted on_______a thorough rest before you l 求 i should have told you before 中文歌词 i love you, but you have your her.是什么意思一道高中英语题：But I think you should have. I so thanked I found you