问题描述：
--May I go and play football with Dick this afternoon,Dad?选什么
--May I go and play football with Dick this afternoon,dad?
--No,you can't go out _your work is being done.
A before B until C as D after
--May I go and play football with Dick this afternoon,dad?
--No,you can't go out _your work is being done.
A before B until C as D after
问题解答：
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