考点1：比较级more...than在结构上与as...as是类似的，需要重复部分谓语。这里tricky的部分是prove，既可以是“prove X”，也可以是“prove to be X”。
1a. 用prove to be X，重复的部分是be动词。
- Uncertainties may prove to be a more serious deterrent to the nuclear industry than is political opposition may (be)
1b. 用prove X，重复的部分是may (prove省略掉了)，或者prove (第二次出现用does指代)
- Uncertainties may prove a more serious deterrent to the nuclear industry than political opposition may (prove)
- Uncertainties may prove a more serious deterrent to the nuclear industry than political opposition does (prove)

考点2：动词ing形式是adj还是noun???
及物动词的ing形式是不能作adj的！！！deter是vt，只能作动名词。deterrent effect才是正确形式，deterring effect是错的！！！

借鉴出处：https://gmatclub.com/forum/financial-uncertainties-from-the-accident-at-three-mile-island-may-pro-305885.html

deterring to the nuclear industry is not correct, as deter is a transitive
verb and requires a direct object

错选E，political opposition如果不把is补回去会有歧意（是Financial uncertainties还是nuclear industry在和political opposition比？）
比较题是否要把beV/助V补回来，要看比较是否模糊

e.g. I know more about Shakespeare than my brother (X)
如果不把助动词加回来会有两种意思，一种是我比我哥更懂S，另一种是相对于我哥来说我更懂S

应改为
I know more about Shakespeare than my brother does
or
I know more about Shakespeare than does my brother
（助动词放前后都可以）

1.逻辑推理，than平行，the nuclear industry than political oppositiond会产生歧义，是拿这两个在对比，所以应该加is，表示主句之间的对比。BCE错
2.简洁表达，even more serious a deterrent不如an even more serious deterrent读起来明白，而且前者会产生歧义，不仅是一个a deterrent，还可以是其他东西？B错
3.Diction,清晰表达，Furthermore, the sentence would be clearer if it said resulting from，ABC相对更差

uncertainties may prove to be a more serious deterrent than political opposition is.

1.逻辑推理，than平行，the nuclear industry than political oppositiond会产生歧义，是拿这两个在对比，所以应该加is，表示主句之间的对比。BCE错
2.简洁表达，even more serious a deterrent不如an even more serious deterrent读起来明白，而且前者会产生歧义，不仅是一个a deterrent，还可以是其他东西？B错
3.Diction,清晰表达，Furthermore, the sentence would be clearer if it said resulting from，ABC相对更差
4.动词，deterring to the nuclear industry 用法错误，deter是及物动词，应该直接接名词，AE错

表示比较 不引起歧义 C 会导致歧义

than后面直接加宾语 会引起歧义
A：than political opposition is， is有没有相对应的be动

A， E： deter是不及物动词，后面要跟宾语，detering 是错的；
ABC: 用from而不是result from是不好
BCE: 比较有歧义。为了消除歧义，要把prove后面的to be补出来，这样policition opposition可以加is

to be an even more serious deterrent to the nuclear industry than political opposition会引起歧义：是一个更大的威胁，比起是一个政治反对。is保留更佳。
要用is，前面就得有sth be这个结构，只剩D了

deterring不是形容词

主语比较补出助动词

A中的prove 与is 平行是可以的，都是系动词

to be an even more serious deterrent to the nuclear industry than political opposition会引起歧义：是一个更大的威胁，比起是一个政治反对。is保留更佳。
要用is，前面就得有sth be这个结构，只剩D了
E，prove even more deterring to the nuclear industry than political opposition会引起歧义：更阻碍核能行业比起阻碍政治反对。

result from ；prove to be 平行 Financial uncertainties may prove to be vs political opposition is

deterring is a transitive verb not an adjective

看见了than，找平行。
A：than political opposition is， is有没有相对应的be动词对应，没有，直接排除
B, C, E：to the nuclear industry than political opposition, 有歧义。
Financial uncertainties prove more deterring to the nuclear industry than financial uncertainties prove deterring to political opposition
还是Financial uncertainties prove more deterring to the nuclear industry than political opposition prove deterring to the nuclear industry
D： than is political opposition， is和前面的be对应，平行。所以对。

排除后只能选A或者D，may prove even more...than...political opposition (do)，所以A错

deterring to the nuclear industry is not correct, as deter is a transitive verb and requires a direct object.
while prove does not have to be followed by to be, here to be is required for parallelism with political opposition is.

to be better + a/an n. than be n.