【题目】 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
在线课程【答案】B
【解析】
试题分析：考查动词的时态和语态。It remains to be seen尚待分晓。句意：对于这对老夫妇来说去国外旅游是件好事情，但是还得看到底他们喜不喜欢。首先it(老夫妇去旅游这件事)还有待于观察，表将来用不定式。这件事情是被观察，因此选被动。综上选B。