关于Have you been

题目

关于Have you been
Have you ever been to Peking?
yes,i have been there -----
Athree times
Bfor three times
Cfor two months
(我主要想问c为什么不对)

答案

选a 因为问了证明人不在北京,所以不用c
b结构不正确
a 去过三次