Havingawalkaftersupperiscertainlygoodfortheoldpeople,b...

问题详情：

 Having a walk after supper 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

【回答】

B

知识点：非谓语动词

题型：选择题