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—Have you ever visited the Water Cube?
—Yes. When I served as a volunteer in Beijing, I      it twice.
A.have visitedB.visited
C.had visitedD.had been visiting
B
考察时态。根据when I served as a volunteer,可知,该句主句用过去时,
句意为,---你去过水立方吗?--是的,当我作志愿者的时候,我去过两次。
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