She heard voices and realized that there___some people in the next room.

问题描述:

She heard voices and realized that there___some people in the next room.
A.had been B.would be C.were beingD.were

主句和从句的事实同时发生,有因果关系,故时态必须一致.都用一般过去时.
全句的意思是:她听到了响声,意识到隔壁房间里有些人.