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No one helped me. I did it all ________ myself.

A.for B.by C.from D.to 

解析試題分析:句意: 沒有人幫助我。我自己做的。for oneself 為自己; by oneself 獨(dú)自的。根據(jù)句意故選B 。
考點(diǎn):考查介詞的用法。

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