—May I go outside and play for a while, Dad?
—No, you can’t your homework is being done.
A. until
B. as
C. before
D. the moment
网友回答
A. until
(答案→)B. as
C. before
D. the moment
解析：考查连词;A. until直到B. as 当…时候，因为C. before在…之前，D. the moment一…就，句意：--我可以出去玩一会吗？--不，你不能，因为你正在做作业。选B。