He insisted that he ____ that and that he ____ free. [ ]

A. didn't do; was set

B. hasn't done; is set

C. hadn't done; be set

D. hadn't done; should set

金融期货交易实行保证金制度和每日结算制度，交易者均以（）为交易对手。

A．卖方

B．期货经纪公司

C．买方

D．交易所（或期货清算公司）