◎ 题干
Having a trip abroad is certainly good for the old couple, 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n多题专家分析,试题“Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.[ ]A. to see B. to be seenC. 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。