—Howlongdoesittaketogettotheairport?              —Fort...

問題詳情：

—How long does it take to get to the airport?

               —Forty minutes. But it’s foggy today. I’m not sure _______ the highway will close soon. Let’s set off earlier.

               A. whether            B. when     C. how           D. that

【回答】

A

知識點：連詞

題型：選擇題