After he left college, he was employed in an international company

and       there ever since .

A．worked

B．has worked

C．had worked

D．was working

企业集成创新发展战略的重要特征是（）

A.需要用户参与

B.将用户需求信息作为产品创新的基本依据

C.强调用户在创新活动中的参与和互动

D.强调的是企业产品开发环境与市场用户信息之间的相互匹配