What really worries us is ______ the explorers can accurately locate themselves with the device in case of bad weather.A．thatB．whereC．whatD．whether-高中英语-魔方格

◎ 题干

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

A．that

B．where

C．what

D．whether

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◎ 解析

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◎ 知识点

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