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【题目】— How long does it take to get to the airport?

— Forty minutes. But it's foggy today. I'm not sure ________ the highway will be closed soon. Let's set off earlier.

A.whetherB.whenC.thatD.why

【答案】A

【解析】

句意:---去飞机场需要多久?---四十分钟。但是今天有雾,我不太确定高速不久后会不会关闭,让我们早点出发吧。whether意为“是否”, when意为“什么时候”, that引导宾语从句没有词义,why 意为为什么”,the highway will be closed soonI’m not sure的宾语,根据句意“不太确定”可知选引导词whether引导宾语从句。

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