It’s foggy today. I’m not sure             the highway will close soon. Let’s set off earlier.

A．whetherB．whenC．howD．why

A

解析試題分析：句意今天有霧。我不知道是否高速公路不久就會關(guān)閉。讓我們早點動身。A. whether 是否； B. when 什么時候；C. how 怎樣；D. why為什么；故選A。
考點：考查引導(dǎo)詞的用法。

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