A:32
B:2
C:81313
D:121313
——_________?
——It's Tuesday, the 3rd.
She didn't sing the song ____ at the party last night.
大卫的成功不是偶然的,那是他艰辛努力的结果。
David's success didn't come ____ ____ . It was the result of his hard work.
设0<x<π2,则“xsin2x<1”是“xsinx<1”的( )