He lost his key,it made him ____in the cold to wait for his mother’s return.
A:to stay
B:stayed
C:stays
D:stay
法国大革命开始和结束的事件分别是( )
函数f(x)=sin(ωx+φ)(其中|φ|<π2)的图象如图所示,为了得到y=sinωx的图象,只需把y=f(x)的图象上所有点( )