题目内容
--- May I go and play with Tom this afternoon, Mum?
---No. You can't go out _____ your homework is being done.
A.until B.since C.before D.if
C

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题目内容
--- May I go and play with Tom this afternoon, Mum?
---No. You can't go out _____ your homework is being done.
A.until B.since C.before D.if
C