【題目】—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

【答案】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(huì)被關(guān)閉”。whether是否；when何時(shí)；how如何；why為什么。根據(jù)句意應(yīng)選A。

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