Hardly a week goes by without some advance in technology that would have seemed incredible 50 years ago.

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问题 Hardly a week goes by without some advance in technology that would have seemed incredible 50 years ago.

选项 A、hard to invent
B、hard to understand
C、hard to imagine
D、hard to believe

答案D

解析 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”。incredible“难以置信的”,与“hard to believe”意思相近。故选D。
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