问题标题：
教育/科学->外语学习->I__theUSAforabouttwoyearsA.havebeentoB.havegonetoC.havebeeninD.havebeen-Wearegoingtohaveafour-dayholiday-____gotoHangzhouforholiday.A.HowaboutB.WhataboutC.ShallweD.Howdowe
问题描述：
教育/科学->外语学习->
I__theUSAforabouttwoyears
A.havebeentoB.havegonetoC.havebeeninD.havebeen
-Wearegoingtohaveafour-dayholiday
-____gotoHangzhouforholiday.
A.HowaboutB.WhataboutC.ShallweD.Howdowe
李得伟回答：
C由for可知是一段时间,用havebeenin
C.Howabout和Whatabout后加doing,shall表示建议的意思
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