题目

阅读与回答问题Happiness is a feeling that lights up your eyes, makes your steps light and makes you want to sing for no reason. Everyone wants to be happy. But sometimes, a guest comes in without invitation. It’s unhappiness. Don’t let it get you down. Send it away.When you are happy, the world feels like a better place. As the saying goes: When you smile, the world smiles with you; when you cry, you cry alone. Wearing a smile makes you more charming(迷人的)and helps you to win lots of friends. A good mood（心情）always gives you hope, which makes trouble and problems easier —How are you getting along with your presentation?—Almost ready, and I ______ all I am supposed to.A.didB.had doneC.have doneD.shall have done