如图，四边形ABCD内接于⊙O，E为DC延长线上一点，∠A = 50º，则∠BCE

如图，四边形ABCD内接于⊙O，E为DC延长线上一点，∠A = 50º，则∠BCE的度数为 ( )

A．40º B．50º C．60º D．130º

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如图，四边形ABCD内接于⊙O，E为DC延长线上一点，∠A = 50º，则∠BCE

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