风湿性心瓣膜疾病最常见的并发症是( )
A．心律失常B．亚急性感染性心内膜炎C．肺栓塞D．心力衰竭E．呼吸道感染
参考答案：D
_____ of this week, I will fly to Shanghai.
A. By the end B. At the end C. In the end
