题目

When asked whether the information on the Internet is true or false, they were not sure. A . half of whom said B . half of them saying C . half of them said D . half of whom saying 答案：C如图，已知在?ABCD中，E、F是对角线BD上的两点，BE=DF，点G、H分别在BA和DC的延长线上，且AG=CH，连接GE、EH、HF、FG．求证：四边形GEHF是平行四边形．