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---May I go and play with Tom this afternoon, mum? ---No.You can’t go out your h

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---May I go and play with Tom this afternoon, mum? ---No.You can’t go out your h

---May I go and play with Tom this afternoon, mum?

       ---No.You can’t go out ______ your homework is being done.

       A.until        B.after  C.before      D.as

试题答案

D

解析: