题目

如图，已知∠ACD＝70°，∠ACB＝60°，∠ABC＝50°.试说明：AB∥CD. 答案：【答案】见解析【解析】试题分析:根据同旁内角互补，两直线平行即可判定.试题解析： ∥ It's the third time that I ________ you ________ your promise． [　　] A．reminded; about B．have reminded; of C．reminded；of D．had reminded; of