Having a trip abroad is certainly good for the old couple but It remains __ whether they will enjoy ...
2022-10-14 11:35:52 73次 人教新目标英语九年级上册Unit5 What are the shirts made of 知识点加单元检测 单选题 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 B. to be seen C. seeing D. seen
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