Mr. White works as a lawyer now, but he      in a company for several years.

       A．worked     B．has worked      C．had worked      D．has been working

Mr White works as a lawyer now, but he ________ in a company for several years.

[　　]

Mr. White works as a lawyer now, but he　　 in a company for several years.

　 A．worked　　　 B．has worked　 C．had worked　 D．has been working

用所给动词的适当形式填空：

( keep develop become hang prepare write hear see work do introduce )

Mr. White works as a lawyer now, but he ________ in a company for several years.