问题
“We must keep a secret of the things here，” the general said at theman in charge of the service office.
A:discussed； and stared seriously
B:being discussed； seriously staring
C:to be discussed； seriously stared
D:having been discussed； and seriously staring
B:being discussed； seriously staring
C:to be discussed； seriously stared
D:having been discussed； and seriously staring
正确答案是：
