— Where is my pen ?  Have you seen ____?

— Oh, sorry.  I have taken ____ by mistake.

A．it; yours

B．them; his

C．it; mine

D．them; hers

社会保险型社会保障实行“自助”原则，强调劳动者个人在社会保险方面的责任，社会保障费用由国家、雇主和雇员三方负担，且以雇主和雇员个人投保为主，政府酌情资助。