In the past, doctors couldn’t do anything about stomach ulcers. Doctors have discovered a cause of ulcers after many years of e

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问题 In the past, doctors couldn’t do anything about stomach ulcers.
Doctors have discovered a cause of ulcers after many years of experiments.

选项 A、Right
B、Wrong
C、Not mentioned

答案C

解析文章头两段只是说医生们找到了一种引发胃溃疡的病因，但并没有提及发现这种病因的时间或者过程。故C为答案。

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