题目

单项选择 He ___________ the car for one year. He ___________ it last June. A.      has had…bought     B. has bought…bought         C. bought…bought 答案：A4、如图，直线AB、CD相交于点O，下列条件中，不能说明AB⊥CD的是（　　）A、∠AOD=90°B、∠AOC=∠BOCC、∠BOC+∠BOD=180°D、∠AOC+∠BOD=180°