— Have you ever visited the Opera House?
—Yes．When I was in Sydney, I it twice．
A. have visited
B. had visited
C. visited
D. would visit
网友回答
A. have visited
B. had visited
(答案→)C. visited
D. would visit
解析：
这题考查时态题：因为时间是When I was in Sydney，所以用过去时，句意是：--你参观过歌剧院吗？--是，当我在悉尼的时候，我去过两次。选C。