—Where`s Mary now? Do you know?

—No, but I heard _____ in her room a few minutes ago. [ ]

A. her singing

B. her sing

C. she was singing

D. all the answers are right

蒲黄炒阿胶的目的是（）

A.降低药物毒性

B.利于贮存保管

C.缓和药物性能

D.协同止血作用

E.温补肝肾，便于服用