- 问题详情:完型填空17Samisabusdriverinabigcity.Alldayhedrivesabusthroughbusystreets.Drivingabigbusinvery1work.Itmakesthedriversunhappy.ButnotSam!Samisalwayshappy.Andthepeoplewhorideinhisbusseemtobehappy,too.Thisstoryshows2.Earlyonemorning,Samstartedhisbig...
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