--how do you find Buckingham Palace?--Very marvelous. I it twice when I was in London.A. had visited B. have visited C. visited D. would visit请问选哪项啊

问题描述:

--how do you find Buckingham Palace?
--Very marvelous. I it twice when I was in London.
A. had visited B. have visited C. visited D. would visit
请问选哪项啊