曼哈顿论坛的两道比较题目

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[size=14.007px]2. A study published in the British Medical Journal showed that women who ate nuts more than five times a week were about one third less likely to suffer from coronary heart disease [size=14.0084px]than were those who ate [size=14.007px]no nuts at all.

[size=14.007px]A. than [size=14.0084px]were [size=14.007px]those who ate
[size=14.007px]B. than those who ate

[size=14.007px]3. Results of a United States study published in the Annals of Internal Medicine have shown [size=14.0084px]that college-educated women and women living in the South and West are significantly more likely to use supplemental hormones than women living [size=14.007px]in the Northeast and Midwest.

[size=14.007px]A. that college-educated women and women living in the South and West are significantly more likely to use supplemental hormones than women living

[size=14.007px]B. that college-educated women and women living in the South and West are significantly more likely to use supplemental hormones than [size=14.0084px]are [size=14.007px]women living

[size=14.007px]In all the questions, option A is correct.
[size=14.007px]I basically want to ask why in 1 and 2 we require the use of verb "are" and "were" respectively, but in Q3, we do not require the verb "are".
这是在曼哈顿论坛上看到的，不太理解为什么求大神解答
链接https://www.manhattanprep.com/gmat/forums/comparision-and-verb-t8288.html