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题目内容 (请给出正确答案)
It is ______ how soon the investigators will arrive at the site.

A.unclear
B.undoubted
C.unreal
D.unaware

参考答案

参考解析
解析:本题考察词义辨析,题目意为“调查员什么时候能够到达现场尚未可知。”A选项意为“不清楚的,不易了解的”,B选项意为“无疑的,确实的”,C选项意为“不真实的,虚幻的”,D选项意为“意外的,不知不觉的”。题目中表示一种不确定性,A选项正确,是时间本身不清楚。D选项的不清楚是人发出的动作,不能用it做主语。
  
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