题目

—Why are you standing there, Daming? —I can't see the blackboard clearly. Two tall boys are sitting me. A . behind B . in front of C . beside D . next to 答案：B如图，已知，AB∥CD，B是∠AOC的角平分线OE的反向延长线与直线AB的交点，若∠A+∠C=75°，∠ABE=7.5°，则∠C= °．