把自然数1，2，3，…99分成三组，如果每一组的平均数恰好都相等，那么这三个平均数的乘积是______．

—Your sister nearly _______ all her spare time to her study during the three years.

—That's right, or she ________ the first place in her school in the examination.

A．devoted; wouldn't have taken

B．spent; wouldn't have taken

C．had devoted; hadn't taken

D．had spent; couldn't take