_____ from endless homework on weekends the students now can have their own

问题描述:

_____ from endless homework on weekends the students now can have their own
from endless homework on weekends the students now can have their own activities,such as taking a ride together to watch the sunrise.
A.Freed B.Freeing C.To free D.Having freed.
我想知道,为什么选A不能选D?

过去分词可以表被动,A选项体现了.而D选项改为having been freed 就可以了啊,含有已经的意思