【题目】As soon as she entered the room, the girl caught sight of the flowers ________ by her mother.
A.buying
B.being bought
C.were bought
D.bought

【答案】D
【解析】句意：女孩一进入房间就看见了妈妈买的花。句中flowers和动词buy是被动关系，指花被买。故选D。