—You should have thanked her before she left.—I meant , but when I was leaving I couldn’t

—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

A. to do (答案→)B. toC. doing D. to have done解析：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。

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