A、  B、  C、  B本句是确认是否有足够的员工在假期值班的助动词(Do)疑问句。

Do you know when the board of directors will selected?
(A)I have no objection.
(B)That hasn’t been announced.
(C)No more than a dozen people.

Do we have enough staff members to work over the holiday?
(A)Yes, that works well.
(B)How many people will we need?
(C)In a small family business.