When the man came in, gun in hand, we all stood there, ________．

A．astonished

B．astonishing

C．being astonished

D．having astonished

目前，我国报关企业大都采取间接代理形式代理报关，直接代理报关只适用于经营快件业务的国际货物运输代理企业。 ( )