问题

It’s more than half a century _____ mygrandfather joined the Party and became a servant to the people
A:that the author is alawyer by profession
B:that the author is alawyer and he seldom gets drunk
C:the reason why the authorhad to resign
D:before
B:that the author is alawyer and he seldom gets drunk
C:the reason why the authorhad to resign
D:before
正确答案是: