GWD 3-10

Q10:

Antarctica receives more solar radiation than does any other place on Earth, yet the temperatures are so cold and the ice cap is reflective, so that little polar ice melts during the summer; otherwise, the water levels of the oceans would rise 250 feet and engulf most of the world’s great cities.

were it to do so是虚拟语气的倒装结构，相当于if it were to do so；

C首先破坏了平行结构：A be so X and B be so Y中两个be动词保证了结构的平行，因此不能省略第二个，况且两个动词的单复数不一致；其次，破坏了so ... that结构，or else在这里不知所云。

另：如果MM不是马上要考试的话，建议不要作GWD的题目，偶认为GWD的题目可以作模考。

多谢指点！！

又想了一想，是不是be 动词完全一样的话就可以省略呢？

if it were to do so的so 在这里好像指代不明确啊？但是在此处用虚拟语气的却有道理。

我也是........ 推一下  想问

1.were=if ?   查了LDOCE   没有这样的用法阿  有人可以举例吗

- Section '1  - ways of saying 'if''
+ List of exponents  :
> if
> should
> had
> even if
> in case
> in the event of
> in case of

2.it 指代 什么? 如果were it to do so=if it were to do so 照逻辑看似乎是ice cap 但是ice cap 后面没有be动词were   如果代temperatures 应该用复数吧

were it to do so 是if it were to do so的倒装句！高中英语语法就讲过！偶敢发誓！

it 指代the polar ice, do so 是代替melt during the summer.