问题补充：
It’s for all of them to the top of the mountain.
A. tiring; getting
B. tired; to get
C. tired; getting
D. tiring; to get
答案：
A. tiring; getting
B. tired; to get
C. tired; getting
(答案→)D. tiring; to get
解析：
试题分析: 句意：对于我们所有人来说，爬到山顶是无聊的。get to到达，top of the mountain山顶；不定式to get to the top of the mountain做真正主语，It形式主语；tiring令人无聊的，修饰物，故选D
