Question

— 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

Answer 1

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。