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

问题补充：

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

A. a, against

B. /, for

C. /, with

D. the, for

答案：

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”