题目

Why would David quit his job?A.To go back to school. B.To start his own firm. C.To work for his friend. 答案：【答案】C【解析】【原文】W: David said he would quit his job at our school.M: Really? Why would he do that?W: His friend started a firm in London. She wanted David to help her.若多项式     A．509            B．510            C．511            D．1022