【題目】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:今天是霧蒙蒙的,我不確定高速公路是否很快就會(huì)被關(guān)閉,讓我們?cè)缫稽c(diǎn)動(dòng)身吧。whether引導(dǎo)詞,是否,引導(dǎo)賓語從句。所以選B。

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