—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
考察時(shí)態(tài)。根據(jù)when I served as a volunteer,可知，該句主句用過(guò)去時(shí)，
句意為，---你去過(guò)水立方嗎？--是的，當(dāng)我作志愿者的時(shí)候，我去過(guò)兩次。
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