―HaveyoubeentotheGreatWall?―Perhapsnotinmymemory.

问题详情：

― Have you been to the Great Wall?

― Perhaps not in my memory. _______, it might have been during my early childhood. 

A. If any                                                 B. If ever                 

C. If once                                               D. If not

【回答】

知识点：交际用语

题型：选择题