So necessary _____ it to learn about their customs that I will attend a special lecture next  week.

A．I have found

B．I feel

C．have I found

D．will I feel

某系统集成项目组需要在Windows 2008 Server操作系统平台上应用C++语言编写相应的应用构件。该项目组宣选用______作为构件标准。

A．EJB
B．COM+
C．CORBA
D．ODBC