According to the passage, why were doctors in the West sometimes unable to help their patients （）A．They did not know how to treat the unfamiliar illnesses.B．They were more interested in establishing practices in the cities.C．They were more concerned with doing research than with treating patients.D．They were often overcome by diseases caught from their patients.

单项选择题

According to the passage, why were doctors in the West sometimes unable to help their patients （）

A．They did not know how to treat the unfamiliar illnesses.
B．They were more interested in establishing practices in the cities.
C．They were more concerned with doing research than with treating patients.
D．They were often overcome by diseases caught from their patients.