【題目】_____ I make a promise to help others, I will manage to complete it.

A. Although B. Once C. Unless D. Before

【答案】B

【解析】考查從屬連詞辨析。句意：一旦我承諾幫助他人，我會(huì)設(shè)法成功地完成承諾。although雖然；once一旦；unless除非，如果不；before在……之前。故選B。

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