He is only too ready to help others，seldom，________refusing them when they turn

to him.

A．if never

B．if ever

C．if not

D．if no

编写水库调度工作培训教材，按照培训计划定期开展（）培训，并加强考核工作。

A.拓展训练

B.业务培训

C.洪水仿真

D.岗位技能