After the trainer was sure that the whale could look after itself he it into the sea.A.

问题补充：

After the trainer was sure that the whale could look after itself, he it into the sea.

A. transported

B. delivered

C. released

D. handled

答案：

A. transported

B. delivered

(答案→)C. released

D. handled

解析：句意：在训练员确信鲸鱼能自己照顾自己后，他将它放进大海。四个选项的含义分别是：A. transported运输，B. delivered传送，C. released释放，D. handled处理，所以选C。