成人高等教育 / 大学英语2（本）
正确率：100%
— 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、
doing so
参考答案：
佳题速递：