不可以省略.其实是倒装,it is hard work to climb.不可以把Climb the mountain 当做名词吗？那就得写作动名词Climbing the mountain...那要加a吧！不用为什么？Climb the mountain was a hard work不是吗？在这句话中，to climb the mountain =cllimbing the mountain原句没加等换后的句子也不用Oh，懂了，谢谢！那什么情况下要加a呢？To climb the mountain was hard work but as we looked around us ,we were surprised by the view中为什么不加a？work一般用作不可数名词，所以不加a.只有在表著作作品之类的才用作可数名词感激不尽！！！