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【单选题】
如果直线a ∥ 平面β，那么下列命题正确的是（ ）A.
平面β内有且只有一条直线与a平行
B.
平面β内有且只有一条直线与a垂直
C.
平面β内有无数条直线与a不平行
D.
平面β内不存在与a垂直的直线
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