◎ 题干
Having a walk after supper is certainly good for the old people, but it remains ______ whether
they will enjoy it.
[      ]
A. to see        
B. to be seen        
C. seeing        
D. 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“Having a walk after supper is certainly good for the old people, but it remains ______ whetherthey will enjoy it.[ ]A. to seeB. to be seen C. seeing D. seen…”主要考查了你对  【不定式的被动式】  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。