og12 101- in the past 与完成时

101. Heavy commitment by an executive to a course of
action, especially if it has worked well in the past,
makes it likely to miss signs of incipient trouble or
misinterpret them when they do appear.
(A) Heavy commitment by an executive to a course
of action, especially if it has worked well in the
past, makes it likely to miss signs of incipient
trouble or misinterpret them when they do
appear.
(B) An executive who is heavily committed to a
course of action, especially one that worked well
in the past, makes missing signs of incipient
trouble or misinterpreting ones likely when they
do appear.
(C) An executive who is heavily committed to a
course of action is likely to miss or misinterpret
signs of incipient trouble when they do appear,
especially if it has worked well in the past.
(D) Executives’ being heavily committed to a course
of action, especially if it has worked well in the
past, makes them likely to miss signs of incipient
trouble or misinterpreting them when they do
appear.
(E) Being heavily committed to a course of action,
especially one that has worked well in the past,
is likely to make an executive miss signs of
incipient trouble or misinterpret them when they
do appear.

答案是E  不太明白 especially one that has worked well in the past. 感觉in the past就相当于过去式的signal 这里为什么可以用 完成时呢？ i

问题：B选项OG上说when they do appear位置不正确，是什么意思呢？