◎ 题干
Mary looked at the picture, wondering where she ______ it before.

[     ]

A. saw
B. has seen
C. sees
D. had seen
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Mary looked at the picture, wondering where she ______ it before. [ ]A. saw B. has seen C. sees D. had seen …”主要考查了你对  【过去完成时】  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。