题目内容

【题目】It's foggy today. I'm not sure _______ the highway will be closed soon. Let's set off earlier.
A.when
B.whether
C.how
D.that

【答案】B
【解析】句意：今天是雾蒙蒙的，我不确定高速公路是否很快就会被关闭，让我们早一点动身吧。whether引导词，是否，引导宾语从句。所以选B。

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