题目

函数（为常数，且）图象的一个对称中心的坐标为（     ） A．             B．（0,0）        C．        D． 答案：BTo tell you the truth, if it were not for the fact that you ________ my daughter, I would not take such pains to serve you.A. wereB. have beenC. had beenD. are