----- Have you ever visited the 2010 Shanghai World Expo?
-----Yes．When I was in China , I ______ it twice．
A．have visitedB．visitedC．had visitedD．would visit
B
考查時態(tài)。句意：你曾經(jīng)參觀過2010年的上海世博會嗎？——是的。當我在中國時，我參觀過兩次�？芍挛拿枋龅氖窃谶^去某個時間發(fā)生的動作，故用過去時態(tài)。選B。
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