单项选择题
Before joining the Deprtment of Defense, Mr. Pnett _______s director of the CI from Februr
y 2Before joining the Deprtment of Defense, Mr. Pnett _______s director of the CI from Februry 2009 to June 2011.would serve B.served C.ws served D.hd been servedA.would serveB.servedC.was serveD.had been served