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. before B. as C. until D. after
B
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--- May I go and play with Dick this afternoon, Mum?
--- No, you can’t go out _____ your work is being done.
| A．before | B．until | C．as | D．the moment |