题目

–He seems to be a student.   --No, he __________. A. used to     B. used to be C. used to have       D. was used to 答案:B完成推理填空:如图所示,已知AD=BC,AB=DC,试判断∠A与∠ABC的关系.下面是小颖同学的推导过程:解:连接BD.在△ABD与△CDB中∵AD=CB     (已知)AB=CD     (已知)BD=DB     (________)∴△ABD≌△CDB  (________)∴∠1=∠2    (________)∴AD∥BC     (________)∴∠A+∠ABC=180°(________)
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