题干
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(点此获取答案解析）
D
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
，（t>0）是角
终边上的一点，则当
最小时，
（ ）