Only           according to the directions can the medicine be quite effective .

A．taking

B．taken

C．being taken

D．having been taken

外科急腹症中最常见的是

A．急性胰腺炎

B．急性胆囊炎

C．急性肠梗阻

D．急性阑尾炎

E．急性胃十二指肠穿孔