Although Johnson ------- great enthusiasm for his employees’ project, in reality his interest in the project was so ------- as to be almost non-existent.
The correct answer is feigned…perfunctory.
I did this question using math strategy the same way as described in the solutions. I did B2 first because it was easier-- I used “as” as support–so B2 should support the idea that he was not interested. B2 could be “minimal.” Then I identified B1 to be part of an idea that contrasted the idea that we was not actually interested using the word “although.” Thus, B2 would have to be “showed.” Using this logic I eliminated “feigned” because if he “faked” enthusiasm, that contradicts the logic–it supports the fact that he is not interested… but this is obviously incorrect, why?
(on the other hand, perfunctory made perfect sense)