◎ 题干
Many people say they have seen Unidentified Flying Objects, which, they believe, ________alien
spaceships.
[     ]
A. are  
B. is
C. have  
D. has
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Many people say they have seen Unidentified Flying Objects, which, they believe, ________alien spaceships.[ ]A. areB. isC. haveD. has…”主要考查了你对  【主谓一致】  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。