Question

用动词的适当形式完成句子

Having a trip abroad is certainly good for the old couple, but it remains ________ (see) whether they will enjoy it.

Answer 1

答案：to be seen
解析：

句意为“去国外旅行对这对老夫妇而言自然是好，但是他们是不是喜欢还有待观察”。此句remain意为“尚待，留待”，后接动词不定式的被动语态。