----- Have you ever visited the 2010 Shanghai World Expo?
-----Yes．When I was in China , I ______ it twice．
| A．have visited | B．visited | C．had visited | D．would visit |
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----- Have you ever visited the 2010 Shanghai World Expo?
-----Yes．When I was in China , I ______ it twice．
| A．have visited | B．visited | C．had visited | D．would visit |
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