来自汤荷美的问题
Thedisappearanceofdinosaursmade___theriseofmammalswhichgavebirthtoyoungbabyanimals.A.itwaspossibleB.itpossibleC.possibletobeD.possible
Thedisappearanceofdinosaursmade___theriseofmammalswhichgavebirthtoyoungbabyanimals.
A.itwaspossibleB.itpossibleC.possibletobeD.possible

