题目

Although there seemed some signs of recovering, experts said that few, _____, could come back to normal after getting this disease.  A. if any                   B. if ever                      C. if not                       D. if so 答案：A   2．设$\frac{4x-9}{3{x}^{2}-x-2}$=$\frac{A}{3x+2}$-$\frac{B}{x-1}$（A、B为常数），求A、B的值．