题目

_____to train his daughter in English, he put an ad like this in the paper,”____,an English teacher for a ten-year-old girl.” A.Determined; wanted   B.Determined; wanting C.Determining; wanted   D.Determining; wanting 答案：A设a，b是非零有理数，且(a+b)2=0，则a2+2b23ab的值为（　　）A．13B．3C．1D．-1