◎ 题干
_____ more clearly, they came up and got close to it.
[     ]
A. Seeing
B. Seen
C. To see
D. To be seen
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“_____ more clearly, they came up and got close to it. [ ]A. Seeing B. Seen C. To see D. To be seen …”主要考查了你对  【不定式】  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。