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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
考察時態(tài)。根據when I served as a volunteer,可知，該句主句用過去時，
句意為，---你去過水立方嗎？--是的，當我作志愿者的時候，我去過兩次。
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