A:won’t; rai
B:will; rai
C:won’t; will rai
D:are going to; is going to rai
若|a→|=1,|b→|=1,且a→⊥(a→-b→),则向量a→,b→的夹角为( )
A: May____ come____, Nancy?
B: Yes,____ ____ come back now.
A: Thanks.
B: You're ____.
下面句子中没有语病的一项是 ( )