下列各项，不属于银行保函内容的是( )。

A．担保人的名称

B．保函开具的时间

C．业主的地址

D．开立保函的依据

Many of them turned a deaf ear to his advice,____they knew it to be valuable.    [ ]

A. as if    

B. now that    

C. even though    

D. so that