— Have you ever visited the Opera House?—YesWhen I was in Sydney, I it twice．A. have vis

— 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

A. have visitedB. had visited(答案→)C. visitedD. 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。

和我的回答一样，看来我也对了

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