问题
选择题
________ the mountains was hard work for them but as they looked around, they could not help screaming.
A．Climb
B．To climb
C．For climbing
D．They climbed
答案
答案：B
考查非谓语动词。句意：爬上山顶对于他们来说是一项艰苦工作，但是当他们看了看四周时，他们忍不住尖叫起来。不定式表示具体的将要进行的动作，结合语境可知选B。