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?
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?
问题解答：
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