英语6.Having a trip abroad is certainly good for the old people

问题描述:

英语6.Having a trip abroad is certainly good for the old people
6.Having a trip abroad is certainly good for the old people,but it remains _____ whether they will enjoy it.
a.to see b.to be seen c.seeing d.seen
为什么

我的看法是选择b
这里it作为主语,代替前面动名词,seen后面实际上省略了BY
整个句子这样理解看看
it remains to be seen by whether they will enjoy it.