Hardly a week goes by without some advance in technology that would have seemed
incredible
50 years ago.
【正确答案】
D
【答案解析】解析：译文为：几乎每周都会出现一次技术突破，这在50年前是难以置信的。incredible难以置信的。hard to invent难以发明的；hard to understand难以理解的；hard to imagine难以想象的；hard to believe难以置信的。