A:he was to be give
B:he was to give
C:was he to be give
D:was he to give
①面对新生活、新环境,感到兴奋和激动 ②学习科目多、难度大,感到压力
③老师忽视他,同学排挤他 ④感到对学习和生活有点不知所措。
函数f(x)=sin2x的导数是( )