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22.(2013江苏无锡,8)—Howlongdoesittaketogettotheairport?一Fortyminutes.Butit’sfoggytoday.I'mnotsurethehighwaywillbeclosedsoon.Lefssetoffearlier.A.whetherB.whenC.howD.why

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22.(2013 江苏无锡,8 ) —How long does it take to get to the airport?

一Forty minutes. But it’s foggy today .I'm not sure       the highway will be closed soon.Lefs set off earlier.

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

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答案和解析
22. A