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    精英家教网 > 高中英语 > 题目详情
    ----- 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
    考查时态。句意：你曾经参观过2010年的上海世博会吗？——是的。当我在中国时，我参观过两次。可知下文描述的是在过去某个时间发生的动作，故用过去时态。选B。
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