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（题文）—How long does it take to get to the airport？ —Forty minutes．But it’s foggy today．I’m not sure__...
题目内容：
（题文）—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
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