题目内容

________ the mountains was hard work for them but as they looked around, they could not help screaming.
A.ClimbB.To climbC.For climbingD.They climbed
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。
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