题目内容：

1.The elephants ought ______ hours ago by the keepers.D
A.to be fed B.to feed C.to being fed D.to have been fed
为什么不选A?
2._____,she ran out of the room.D
A.Having tears in her eyes and turned suddenly
B.Turning suddenly,with tears in her eyes
C.With sudden turn tearful eyes
D.With tears in her eyes and a sudden turn
ABC为什么不行?
3.Are you going to the dance _____?A
A.to be held B.to hold C.be held D.held
C和D为什么不行