_____ took me almost 20 years to have the courage to ask my father this personal question.

A．This

B．It

C．That

D．One

某专业报关公司受境内一企业的委托，在向海关办理货物进口申报手续时，按规定交验了报关单及随附的货运和商业单证。海关可以要求报关公司另呈报委托单位的报关委托书。