– I’m sorry I stepped on your toe; it was an accident.
– It wasn’t! You did it .
A. by accident
B. at present
C. on purpose
D. at dusk
网友回答
A. by accident
B. at present
(答案→)C. on purpose
D. at dusk
解析：句意：---对不起，踩到你的脚趾了，这是个意外。---不，你是故意这么做的。A. by accident偶然，意外地；B. at present 目前；C. on purpose 故意地；D. at dusk傍晚，黄昏时刻。对方否定了那是个意外的说法，可见他认为那是故意的。故选C。