题目

下列四组线段中，可以构成直角三角形的是（   ）A．1，2，3B．2，3，4 C．3，4，5D．4，5，6 答案：C解析:略 Only after Li Qi focused on his strengths instead of his weakness ___________ himself from his inferiority complex（自卑感）.A．he freedB．he had freedC．did he freeD．had he freed