The lake is so deep that it is dangerous______a.to swim in b.swim in c.to swim d.swimming答案选c,为什么不能选a
热心网友
The lake is so deep that it is dangerous______a。to swim in b。swim in c。to swim d。swimming本题答案应该选A,而不是C。原答案有误。看两对句子:It is dangerous to stand on that chair。That chair is dangerous to stand on。It is difficult to understand him。He is difficult to understand。从上面两对句子中,不难发现,若动词是及物的,则直接将动词后面的宾语提到句子的开头,作主语。若动词为不及物,在将后面名词提到句子开头作主语的同时,不及物动词后面的介词要保留在原位置上。"it is dangerours to ___________。"这里的it实际上指的是"the lake",所以必须选A,才能表达出"在此河"游泳的意思。The lake is so deep that it is dangerous to swim in。这条河如此深,以至于在河里游泳非常危险。。
热心网友
是答案错了咯,应该是：The lake is so deep that it is dangerous to swim in.so...that... 如此...以致...that 引导结果状语从句，it是形式主语，真正的主语是to swim in (the lake),相当于To swim in the lake is dangerous.
热心网友
因为前面的先行词是 that所以前面可以省略掉in, 这是倾向于口语的一种用法.如是which, 就更正式一些.就不可以省略了,可以用A to swim in了.
热心网友
语感 in又不是和swim构成固定搭配拉