题目

―Are you still busy? ―Yes, I ________ my work, and it won’t take long. A. just finish                                  B. am just finishing C. have just finished                           D. am just going to finish 答案：B 现在进行时表将来，第二句句意为：是的，我正要完成工作，它不会花费太长时间的。若x1、x2是方程x2-3x-2=0的两个实数根，则x1+x2的值为（　　）A．3B．2C．-3D．-2