题目

Which sentence is wrong?A．We don’t think it necessary to give students tests every week.B．We don’t have to worry about not having enough to eat now.C．My father has left school for over twenty years.D．He was heard singing a pop song when I passed his room. 答案：D解析:略17、平行四边形的对角线长分别为10cm和16cm，则该平行四边形其一边长x的取值范围是3cm＜x＜13cm．