far superior to & more superior than

[Shiyuan]

Hi.
This test is from the Inner Mongolia University's postgraduate examination of 2012.

"This design is _____ that one."
A. more superior to
B. far superior than
C. far superior to
D. more superior than

Why choose C instead of D?

 

[5jj]

More superior is wrong; "superior" means "better", and we don't say "more better".

 

[Tarheel]

The phrase "far superior to" is used every day.