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It’s foggy today. I’m not sure             the highway will close soon. Let’s set off earlier.
A.whetherB.whenC.howD.why
A

试题分析:句意今天有雾。我不知道是否高速公路不久就会关闭。让我们早点动身。A. whether 是否; B. when 什么时候;C. how 怎样;D. why为什么;故选A。
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