单项选择题
A.has taken B.has been taking C.is taken D.has been taken
It's not safe（）in the street.A.playedB.playC.playingD.p...
单项选择题It's not safe（）in the street.
A.played B.play C.playing D.plays
He carried on（）after his accident.A.to workB.workC.work...
单项选择题He carried on（）after his accident.
A.to work B.work C.working D.worked
（）for the Olympic Games begins about ten years in advan...
单项选择题（）for the Olympic Games begins about ten years in advance.
A.Bid B.To bid C.Bidding D.To be bidden
