题目

Before I realized what         , the man had seized my bag and run off with it. A．happened                                         B．will have happened C．was happening                      D．had happened 答案：C如图6,D,E,F依次是等边△ABC的边AB, BC, AC的中点．在以A,B,C,D,E,F为起点或终点的向量中,图6(1）找出与向量相等的向量;(2）找出与向量共线的向量.