◎ 题干
— Where is Betty?
— She ______ on the playground half an hour ago.
[     ]
A. sees
B. saw
C. is seen
D. was seen
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— Where is Betty? — She ______ on the playground half an hour ago. [ ]A. sees B. saw C. is seen D. was seen …”主要考查了你对  【被动语态】【一般过去时】  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。