Having a trip abroad is certainly good for the old couple but it remains whether they wil

问题补充：

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：

A. to see

(答案→)B. to be seen

C. seeing

D. seen

解析：考察remain的用法。Remain的用法是，sth remain to be done意为某事留待以后。。。。

句意为，去国外旅行对于这对夫妇来说当然是非常好了，但是他们是否喜欢还有待以后来看