题目内容

【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.whether
B.when
C.how
D.why

【答案】A
【解析】句意：——要多久才能到机场？——40分钟，但是今天有雾，我不确定公路是否会马上被关闭。我们早点出发吧。whether是否；when何时；how怎样；why为什么。根据句意可知选A。

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