在四边形ABCD中，E、F、G、H分别是四条边的中点，要使四边形EFGH为矩形，四边形ABCD应具备的条件是（    ）

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                                                                                             大堰河，是我的保姆。
                                                                                             她的名字就是生她的村庄的名字，
                                                                                             她是童养媳，
                                                                                            大堰河，是我的保姆。
                                                                                            我是地主的儿子；
                                                                                            也是吃了大堰河的奶而长大了的
                                                                                            大堰河的儿子。
                                                                                            大堰河以养育我而养育她的家，
                                                                                            而我，是吃了你的奶而被养育了的，
                                                                                            大堰河啊，我的保姆。
                                                                                            大堰河，今天我看到了雪使我想起了你：
                                                                                            你的被雪压着的草盖的坟墓，
                                                                                            你的关闭了的故居檐头的枯死的瓦菲，
                                                                                            你的被典押了的一丈平方的园地，
                                                                                            你的门前的长了青苔的石椅，
                                                                                            大堰河，今天我看到了雪使我想起了你。