太奇怪的instead与instead of与rather的OG12 -50对比求解释！！

alicejingli

50. According to some analysts, the gains in the stock
market reflect growing confidence that the economy
will avoid the recession that many had feared earlier in
the year and instead come in for a “soft landing,”
followed by a gradual increase in business activity.
(A) that the economy will avoid the recession
that many had feared earlier in the year and
instead come
(B) in the economy to avoid the recession, what
many feared earlier in the year, rather to come
(C) in the economy’s ability to avoid the recession,
something earlier in the year many had feared,
and instead to come
(D) in the economy to avoid the recession many
were fearing earlier in the year, and rather
to come
(E) that the economy will avoid the recession that
was feared earlier this year by many, with it
instead coming
我想问原来新东方不是说如果instead 与rather than同时出现就一定是rather对吗？如下面这道题！！可是这道题为啥不一样？

40. In metalwork one advantage of adhesive-bonding over spot-welding is that the contact, and hence the bond­ing, is effected continuously over a broad surface instead of a series of regularly spaced points with no bonding in between.

(A)instead of

(B)as opposed to

(C)in contrast with

(D)rather than at

(E)as against being at

这个当时讲的选D


还有这道题也首先排除的选项就是有instead 的选项！！

55. A recent study has found that within the past few years, many doctors had elected early retirement rather than face the threats of lawsuits and the rising costs of malpractice insurance.

(A)had elected early retirement rather than face

(B)had elected early retirement instead of facing

(C)have elected retiring early instead of facing

(D)have elected to retire early rather than facing

(E)have elected to retire early rather than face

那最上面那题目，为啥不要选instead？

或者大家觉得这句话“看到 instead 不一定错，不是instead of ，不能改成 instead/rather     to/doing 等形式”能推广到所有语法题吗？