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

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A. for
B. by
C. from
D. to
解析：考查介词与代词的搭配构成的短语的辨析。for oneself亲自；by oneself单独，独立；to oneself独占, 独用;from oneself从自己。根据句意应选B，我自己能做它。