问题
选择题
— May I go and play football with Dick this afternoon, Dad?
— No, you can’t go out ________ your work is being done.
A．before
B．until
C．as
D．after
答案
答案：C
此题很容易错选B。误认为是not…until句型。实际上只要抓住your work is being done. 这一提示就找到了答题的关键。