ManypeoplesaytheyhaveseenUnide

发布时间：2020-07-28 16:13:59

Many people say they have seen Unidentified Flying Objects, which they believe ________ alien spaceships．A.areB.isC.haveD.as

网友回答

A解析由objects和spaceships可知，此处表复数意义。“他们相信飞碟是外星人的飞船。”
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