题目

There wasn’t much food in the house, but somehow the mother managed to find enough to make a cake.Her three children ______ the afternoon cutting pictures from a magazine and making a wonderful birthday card for their father. They loved him very much. He worked hard in the woods every day and always came home ______ with a smiling face.Most children simply went to the store and bought a birthday card for their fathers. This family didn’t have enough food in the cupboards. ______ they made a card and wrote a lovely little message to their father. It said:Happy ______ to the best father in t与椭圆共焦点且过点的双曲线方程是 (    )A．B．C．D．