. _______, he always tries his best to complete it one time.

A However the task is hard            B However hard the task is

C Though hard the task is              D Though hard is the task

出自汉代张仲景《伤寒杂病论》的内容是（）

A."启我爱医术，复爱世间人，愿绝名利心，尽力为病人。"

B."医本活人，学之不精，反为夭折。"

C."先知儒理，然后方知医理……。"

D."我愿尽余之能力及判断力所及，遵守为病家谋利益之信条。"

E."留神医药，精通方术……以善其生。"