—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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◎ 解析
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◎ 知识点
根据n多题专家分析，试题“—Have you ever visited the Water Cube? —Yes. When I served as a volunteer in Beijing, I it twice.A．have visitedB．visitedC．had visitedD．had been visiting…”主要考查了你对 【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
◎ 相似题
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