I should apologize to you for failing to visit you last week, but I've been very busy_____ the past few months.

A．since

B．before

C．among

D．over

主办人对应当实施行政处罚的行为不实施或拖延实施行政处罚，或者以费代罚的，应追究主办人的主要过错、失职责任。