题目内容：

it's useless ---- that you didn't know the rules.
A.your pretending B.you not know C.you to pretend D.for you not knowing

优质解答

C.for you to pretend （掉了个for),
这是不定式的复合结构作真正主语的
如果选项C 就是这样的,那就只能选A了,your pretending that you didn't know the rules 这个动名词的复合结构作真正主语.

追问：

难道是书本印错了。。。

追答：

这个结构一般用于 It is no use/good (one's doing sth) It is useless for sb to do sth. 当然 It is useless one's doing sth 也没错， 但不常见。