题目

Last week, only two people came to look at the house, __________ wanted to buy it. A. none of them B. both of them C. none of whom D. neither of whom 答案:D。 解析: 由于前面提到的是两个人,故后面只能用表两者的both或neither,据此可排除A和C。由于空格前用的是逗号,且没有连词,故只不能选B,而要选D,因为neither of whom为非限制性定语从句,用以修饰two people。已知多项式2ax4+5ax3-13x2-x4+2013+2x+bx3-bx4-13x3是二次多项式,则a2+b2=__.
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