.

. To her disappointment, what she had devoted herself to ____ in nothing but failure.

A．resulting

B．results

C．has resulted

D．resulted

根据无税MM理论，当企业负债的比例提高时，下列说法正确的有（）。

A.权益资本成本上升

B.加权平均资本成本上升

C.加权平均资本成本不变

D.债务资本成本上升