—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

A 【解析】試題分析：由答句中“但是今天有霧”可知“我不能肯定高速公路是否不久后會被關(guān)閉”。whether是否；when何時；how如何；why為什么。根據(jù)句意應選A。
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