Seeking for some help in GWD-4

lizhi7984

Q28:

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.

is reflective, so that little polar ice melts during the summer; otherwise,

is so reflective that little of the polar ice melts during the summer; were it not to do so,

so reflective that little polar ice melts during the summer, or else

reflective, so that little of the polar ice melts during the summer, or

reflects so that little of the polar ice melts during the summer; if it did

The correct answer is B(at least in my answer list).

But I think that the expression "were is not to do so" is wordy.

I remember that there is a sentence form: A be ... and B be... . In this form, the second "be" is omissible. If this form can not apply to the answer C, I wonder whether the reason why it can not apply to the answer C is that the former is "are" and the latter is "is" and therefore the latter, as in the form above, can not be omitted.

Thanks for your help!

lizhi7984

没人理我，自己顶一下

bonniexq

去置定的讨论汇总区找吧，都有讨论的

lizhi7984

我去看了，没有讨论这一题