Many workers are out of condition. Therefore, the union fights better working conditions

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A. a, against
(答案→)B. /, for
C. /, with
D. the, for
解析：考查冠词和介词，固定词组out of condition意思“身体不好”，fight for意思“争取”，fight against意思“反对”，fight with意思“与…争斗”，句子意思“许多工人身体不好，因此，联邦争取较好的工作条件”