题目

Jack's tennis is in his room. (对画线部分提问） Jack's tennis? 答案：【1】Where【2】is已知x为任意有理数，则多项式-1+x-14x2的值为（　　）A．一定为负数B．不可能为正数C．一定为正数D．可能为正数，负数或0