Question

he finished his homework _____. 选择题??

he finished his homework _____.
A,on his own
B.by his own
C,in his own
D.at his own
为什么是选A啊？？ 我觉得选B啊,介词应该怎么用啊.唉

Answer 1

on one's own=do sth.by oneself=do sth alone

Answer 2

on one's own 固定搭配＝by oneslef

Answer 3

固定搭配：do something on one's own

Answer 4

on one'own 是个固定短语，其含义=do sth by oneself,即靠自己/独立去做........的意思，在句子中常用作方式状语。