急性胆囊炎最严重的并发症是

A．细菌性肝脓肿

B．胆囊积脓

C．胆囊坏疽穿孔

D．并发急性胰腺炎

E．胆囊十二指肠内瘘

If you are interested, we will send you a sample lot ______ charge.

A. within
B. for

C. free of
D. with