—You should have thanked her before she left.

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—You should have thanked her before she left.
—I meant ________,but when I was leaving I couldn’t find her anywhere.
A．to do B．to C．doing D．to have done

B
这是一组对话.上文,你应在走之前感谢她.下文,我打算这样做,但是当我要离开时去找不到她.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）.A的do是一个实义动词,需要加宾语sth,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.
考点：动词不定式的省略形式
点评：为了避免重复,省略句子中的一个或几个成分,这种语法现象称为省略.不定式的省略一般有三种常见形式：省略动词原形而保留符号to 、省略不定式符号to和省略整个带to不定式.

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