The prince and princess lived a happy life since then不明白了 为什么这里用一般过去式?since可以不用现在完成时吗?求大神讲解 谢谢

游龙戏凤 THE PRINCE AND THE SHOWGIRL怎么样 THE PRINCE AND THE PAUPER怎么样 she and the prince dance t( )very well the prince and princess lived a happy life ever after HARRY POTTER AND THE HALF BLOOD PRINCE怎么样 HARRY POTTER AND THE HALF BLOOD PRINCE怎么样 the happy prince and other tales是谁写的 THE LITTLE PRINCE怎么样 the little prince翻译 The frog prince是什么意思 THE PRINCE怎么样 The Prince of Darkness The Frog Prince是什么意思 the black prince.. THE MODERN PRINCE怎么样 AP Chemistry的量子力学问题（高分!）Two important concepts that relate to the behavior of electrons in atomic systems are the Heisenberg uncertainty principle and the wave-particle duality of matter.(a)state the Heisenberg uncertainty princ then the prince takes the glass shoe and asks f( )door to door around the country prince just wait and see