(2013·成都一模)________ all the homework assigned by the school, the students have to work at it till midnight.

A．Completing

B．To complete

C．Having completed

D．To have completed

风险免疫管理策略的核心思想是通过资产久期和负债久期的匹配，实现（）的相互抵消．进而锁定整体收益率。

A.利率风险和购买力风险

B.利率风险和再投资风险

C.利率风险和流动性风险

D.利率风险和汇率风险