A:might
B:should
C:could
D:must
设α,β分别为两个不同的平面,直线l⊂α,则“l⊥β”是“α⊥β”成立的( )
—Don't play near the classroom, please.
—_______.
多音字组词。
挑tiǎo____ tiāo____
折zhé____ shé____