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What really worries us is __________the ...

What really worries us is __________the explorers can accurately locate themselves with the old device in case of bad weather.

A.that B.where C.what D.whether

 

D 【解析】 考查表语从句。句意:真正让我们担心的是,在恶劣的天气条件下,探险者们能否用旧设备准确定位自己的位置。that引导表语从句,无词义,不作成分,仅起引导作用;where“……的地方”作状语;what“什么;……的(样子,东西……)”,作主语、宾语或表语。依据题意,此处用连词whether“是否”引导的表语从句,故选D。  
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