No one helped me . I did it all myself A. for B. by C. from D. to

网友回答

A. for
(答案→)B. by
C. from
D. to
解析：(all) by oneself=without help意为“单独地，靠自己”；for oneself意为“为自己”；to oneself意为“自私的；为…所单独有的”。