◎ 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
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据魔方格专家分析,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 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。