—May I go out to play soccer ball?
—I’m afraid not. You can’t play you have finished your homework.
A. after
B. when
C. of
D. unless
网友回答
A. after
B. when
C. of
(答案→)D. unless
解析：A. after在…之后B. when当…时候 C. of…的D. unless除非；句意：我可以出去踢足球吗？恐怕不行，你不能去踢，除非你完成了你的家庭作业。故选D.