答案A
convince
convince sb.+that从句意为"使……相信,说服……".
convince sb of sth; I tried to convince them of his innocence.convince sb to do sth; We convinced him to go by car.
convinced adj Be convinced of/that; I am convinced of his guilt./I am convinced that he is guilty.convincing adj令人信服的
reinforce 加强,增强.pledge发誓,保证."