单项选择题
A．admit their incorrect writing B．make use of their dictionaries in writing C．can correct their own papers D．help each other in their writing class
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.
A．could B．can C．would D．will