— 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 so
C. If ever
D. If not
网友回答
A. If any
B. If so
(答案→)C. If ever
D. If not
解析：考查省略。句意：你去过长城吗?也许不记得了。如果曾经去过，可能是在我童年的时候。If ever 如果曾经，所以选C。