Which of the following can be inferred from the passage about patent medicines？ （)A．They
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Which of the following can be inferred from the passage about patent medicines？ ()
A．They did not cost much.
B．They helped heal snake bites.
C．They did not work very well.
D．They had a strong taste.
请帮忙给出正确答案和分析，谢谢！
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