Taking a trip abroad is certainly good for old couples, but it remains ____ whether they will enjoy ...
2022-12-18 22:07:16 138次 2014届吉林省龙井市高二下学期第一次月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Taking a trip abroad is certainly good for old
couples, but it remains ____ whether they will enjoy it.
A．to see B．to be seeing C．to have seen D．to be seen
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