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单选题
Until about a century ago, the deep ocean floor, was completely inaccessible, hidden beneath waters averaging 3,600 meters deep.
A

understandable

B

recognizable    

C

unreachable      

D

unusable


参考答案

参考解析
解析:
inaccessible达不到的,难接近的。unreachable不可及的。understandable可理解的。recognizable可承认的。unusable不能用的。
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