外用有清热止痛、消肿之功，为五官科常用药的是（）

A.苏合香

B.石菖蒲

C.远志

D.冰片

E.生石膏

I’m considering      a computer, which is considered      a great help to my work.

A．to buy, being

B．buying, to be

C．buy, being

D．to buying, to be