已知 α , β , γ 是三个不重合的平面, a , b 是两条不重合的直线,有下列三个条件:① a ∥ γ , b ? β ;② a ∥ γ , b ∥ β ;③ b ∥ β , a ? γ .如果命题“ α ∩ β = a , b ? γ ,且________,那么 a ∥ b ”为真命题,则可以在横线处填入的条件是( ).
A.
①或②
B.
②或③
C.
①或③
D.
只有②
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