--MayIgoandplaywithTomthisafternoon,Mum?--No.Youcan'tgo...

問題詳情：

--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

【回答】

B

知識點：倒裝與省略

題型：選擇題