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【单选题】
已知三条直线m，m，l，三个平面α，β，γ，下列四个命题中，正确的是（ ）A.
α⊥γ β⊥γ ? α ∥ β
B.
m ∥ β n⊥m ? l⊥β
C.
m ∥ y n ∥ y ? m ∥ n
D.
m⊥y n⊥y ? m ∥ n
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