有几种句式,其实道理一样
it is adj to do sth
it is n doing sth
D 就是符合IT IS N DOING STH
比如,it no use/need doing sth
意思是,做什么事情是没必要的
就是动名词做主语的变型
所以,此题的答案是cd
difficult 和 difficulty
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