问题描述：
-May I go to play football with Dick now,Dad?
--No,you can’t go out _____ your work is being done.
A.before B.until C.as D.after
为什么不能选b
--No,you can’t go out _____ your work is being done.
A.before B.until C.as D.after
为什么不能选b
问题解答：
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