13._____ I make a promise to help others,I will manage to complete it.
A.AlthoughB.OnceC.UnlessD.Before

分析 一旦我承諾幫助他人,我會設(shè)法成功地完成承諾.

解答 答案是B.本題考查從屬連詞辨析.a(chǎn)lthough雖然;once 一旦;unless除非,如果不;before在…之前;才;根據(jù)語境,"一旦"承諾,就設(shè)法完成,故選B.

點評 首先要理解連詞的功能:并列連詞連接并列的詞、短語或句子;從屬連詞連接主從句;其次理解各連詞含義;最后結(jié)合語境做出判斷.

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