—Have you ever visited the Water Cube?
—Yes. When I served as a volunteer in Beijing, I it twice.
| A．have visited | B．visited |
| C．had visited | D．had been visiting |
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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 visited | B．visited |
| C．had visited | D．had been visiting |
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