诱发DIC最常见的病因为（）

A.恶性肿瘤

B.手术及外伤

C.革兰阴性细菌感染

D.产科意外

E.代谢性酸中毒

— What have you been busy with these days?

— I ______ that the speech contest has been brought forward, so I ______ for it. [ ]

A. was informed; have been preparing  

B. have informed; am preparing

C. informed; have prepared              

D. was informed; prepared