Scientific advances have made transplants possible that were ________ even a few years ago, ushering in an era where social and

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问题 Scientific advances have made transplants possible that were ________ even a few years ago, ushering in an era where social and ethical considerations take center stage.

选项 A、unjustifiable
B、unintentional
C、unsustainable
D、unimaginable

答案D

解析 本题考查形容词含义。A不合道理的,不能分辨的;B非故意的,无意识的;C不能持续的,无法维持的;D不可思议的,难以想象的。该句的大意为:科学进步使数年前无法想象的器官移植成了可能,从而迎来了一个以社会责任和道德准则为中心的时代。
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