I ____ Mr. White at that time,otherwise I wouldn’t have asked you for some information about him.

下列句子中，加点的成语使用恰当的一项是（ ）

Yin1895 after Japan defeated the Qing Dynasty in a war.

The young man has never been toHong Kong, _____________

production of television commercialsmust be professional ________ they aim at promoting good service, or publiceducation.