it 作为形式主语代替后面的动词不定式,这个句型是It takes +多长时间+to do sth.表示做某事要花费多少时间.
后面那句before从句前置,但it不能省略,必须用啊!
在这句话中make a descent不能算是词组.是说在地面下陷形成一个非常深的洞穴之前,只要花八天的时间就能搭起绳梯并且建立供应基地.
It can take as long as eight days to rig up rope ladders and
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