困惑,pay off 在这里该不该用被动 四级真题“Our efforts will pay off if...” 我觉

不用,没见过这个词有被动语态的.
pay off
有报偿；赚回；得到好处；收到效果：
It has been rather costly to install the machinery,but it should pay off in the long run.
安装这套机械代价很高,但从长远来看它会赚钱的.