A:while devoting
B:while devoting himself
C:while he was devoted
D:while devoted
已知命题 P:∀x∈0,π2,sinx<x ,那么命题 ¬P 是____.
化解与老师的误解、矛盾,增进与老师的情感,一切从( )
我国唯一注入北冰洋的河流是( )
____是构成生物体的基本结构和功能单位.
Every day I spend two hours __________ my homework.