题目内容：
One of the problems the American injured workers faced in getting compensation in the early 20th century was that ________．
A．they had to have the courage to sue for damages in a court of law B．different states in the U．S．had totally different compensation programs
C．America's average compensation benefit was much lower than the cost of living
D．they had to produce evidence that their employers were responsible for the accident
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答案解析：