Measures have been taken to prevent the accidents, but much _____ for more improvement.

A．remains to be done

B．is remained to do

C．remains to do

D．is remaining to be done

能有效规避工作差错造成的组织利益的巨大损失的绩效考核方法是( )。

A．关键事件法

B．不良事故评价法

C．行为锚定法

D．强制分布法