—Excuse me , could you please tell me which gate______?

—Er , sorry , I don’t know that ,either . [ ]

A. we have to go to  

B. we had to go to

C. did we have to go to  

D. should we have to go to

将考生文件夹下DONG\OUM文件夹中的文件SSE.HLP移动到考生文件夹下JING文件夹中，并将该文件改名为PIDU.DOC。