问题补充：
----How did he finish the work?----I hear that he did it
A. in the own
B. on his own
C. of the own
D. all his own
答案：
A. in the own
(答案→)B. on his own
C. of the own
D. all his own
解析：本句是意思是“他是怎样完成这项工作的？”“我听说他是独自完成的。”on one’s own是“独立地”“靠自己的力量”的意思，是固定用法。所以本题选B。
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