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【单选题】
The working conditions of skilled workers in the meat-packing industry during the 1880's were influenced byA.
the efforts of social workers to improve sanitation in the packinghouses.
B.
improvements in the industry's packing process that occurred in the 1880's.
C.
the workers' ability to perform. the industry's complex tasks.
D.
the workers' determined complaints about the rate and conditions of their work.
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