秦朝三公九卿制中，职责为“下达皇帝诏令；执掌群臣奏章；监察百官”的官职为（ ）

A．丞相

B．太尉

C．御史大夫

D．郡守

As he ______ to his work that he didn't notice that it was already past midnight.    [ ]

A. was so busy  

B. so devoted  

C. was so devoted  

D. was so turned