问题补充：
---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
答案：
A. to do
(答案→)B. to
C. doing
D. doing so
解析：选B。本句中的meant意思是“本来打算”应该使用不定式。当与want, wish, hope, like, hate, try, have, ought, used, need, be able, be going, be glad, mean等连用时， to代替不定式结构以避免重复。
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