Having been familiar with his ability, ().
A、the manager was assigned a challenging task
B、the manager assign a challenging task
C、the board assigned him a challenging task
D、a challenging task was assigned to the manager
A、the manager was assigned a challenging task
B、the manager assign a challenging task
C、the board assigned him a challenging task
D、a challenging task was assigned to the manager
A、Having not been written carefully B、Not writing carefully C、Having written not carefully D、Not having been written carefully
A、A.Having ignored him B、B.To have been ignored C、C.To be ignored D、D.Having been ignored