Having a trip abroad is certainly good for the old couple, but it remains _____ whether they will en...
2022-10-30 03:09:02 20次 2014-2015学年吉林实验中学高一下期末英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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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