By the time the police came to rescue the old woman, she for four days under the house.A.

网友回答

A. buried
B. had buried
(答案→)C. had been buried
D. has been buried
解析：考查时态及语态。By the time+ 一般过去式的句子，后面的主句应用过去完成时态，句意：到警察来就这位老妇人的时候，她已经在房子下面被埋了四天了。根据语境应用过去完成时态的被动语态。故选C。