As soon as she entered the room the girl caught sight of the flowers by her mother.A. b

问题补充：

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：

A. buying

B. being bought

C. were bought

D. bought

解析：bought过去分词作定语，修饰flowers。