—I’m sorry I stepped on your foot; it was an accident.—It wasn’t! You did it .A. as usua

问题补充：

—I’m sorry I stepped on your foot; it was an accident.

—It wasn’t! You did it .

A. as usual

B. on purpose

C. at an end

D. right away

答案：

A. as usual

(答案→)B. on purpose

C. at an end

D. right away

解析：句意：上文，很抱歉，我踩了你的脚；这是一次意外。下文，不是，你是故意的。as usual像往常一样 on purpose故意地 at an end结束 right away马上，选B。