题目

More than one ________ the people heart and soul. A. official has served                         B. officials have served C. official has served for      D. officials have served for   答案：Amore than one修饰单数名词且谓语用单数形式，又因serve表示”为……服务”时是及物动词，故选A。  已知多项式函数f（x）的导数f′（x）=x2+4x，f（-3）=10，求f（x）的表达式．