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已知集合A={x|x2-3x+2=0}，B={x|x2-ax+a-1=0}，C={x|x2-mx+1=0}，且A∪B=A，A∩C=C，求实数a，m的取值范围．