Sorry,I didn’t break the cup ．I know it is your favorite，so I will buy you a new one．
A. by mistake
B. ever since
C. on purpose
D. as usual
网友回答
A. by mistake
B. ever since
(答案→)C. on purpose
D. as usual
解析：考查词组：A．by mistake错误地，B．ever since自从那时，C．on purpose故意地，D．as usual象平常一样，句意：对不起我不是故意打破杯子的，我知道这是你最喜欢的，所以我会买个新的给你。选C。