Having suffered such heavy loss,the businessman didn't have the courage to go on.有疑问?那主句谓语是一般过去式,但boss与suffer是主动关系,suffer发生在主句前.为何不用过去完成时?而用having Suffer

Having suffered such heavy loss,the businessman didn't have the courage to go on.
有疑问?那主句谓语是一般过去式,但boss与suffer是主动关系,suffer发生在主句前.为何不用过去完成时?而用having Suffer