用于阴虚火旺所致的口腔炎症的是（）

A．清咽丸

B．口炎清颗粒

C．补肾固齿丸

D．口腔溃疡散

E．玄麦甘桔颗粒

Many kinds of books, newspapers and magazines _____ in this library.[ ]

A. are kept

B. is being kept

C. are keeping

D. have kept