孙思邈主张医家必须具备“精”，是指

A．不断学习，提高医疗技术，有精湛的医术

B．不断学习，对病人一心赴救

C．不断学习，对病人一视同仁

D．不断学习，有高尚医德 E，不断学习，热爱救人

In my opinion, all Mr. Li ______ good to his students in his class at present. He is very strict with them in their studies.

A．does does does

B．does do did

C．does does do

D．did do does