问题描述：
求下面问题解释及over和beyond的区别.
-Mom,i have finished all my home work.Could i go downstairs to play with other children?
-Certainly,but don't remain out____ nine o'clock.
A.through b.over c.before d.beyond (选d)
-Mom,i have finished all my home work.Could i go downstairs to play with other children?
-Certainly,but don't remain out____ nine o'clock.
A.through b.over c.before d.beyond (选d)
问题解答：
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