difficult 和 difficulty

Question

It's easy to pay lip service to the idea of equality for women, but in practice this is often _____.
A.difficult to achieve it B.difficulty achieving
C.difficult to achieve D.difficulty achieving
请解释一下为什么D也可以的？？谢谢

Answer 1

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

Answer 2

c,
difficult是形容词哦
difficulty则是名词
句子完整，不用最后再加一个it
形容词加to do 是固定搭配

Answer 3

D应该不行吧，have difficulty in doing sth做某事有难度 difficulty是名词，不能像D那样用吧

Answer 4

选C，difficult 作表语 to achieve 为补语