Happened to solve this question in my practice test.

The wild onion, as well as the more common wild garlic, has leaves so filled with pungent oils that when they are eaten by cows, the milk has a disagreeable odor and taste.

A has leaves so filled with pungent oils that when they are eaten by cows
B have leaves so much filled with pungent oils that when cows are eating it
C have leaves filled with oils of so much pungency that when cows eat them
D has a leaf filled with oils of such pungency that when cows eat them
E has a leaf so filled with pungent oils that when it is what cows are eating

Is the form 'so+verb' acceptable in official GMAT? I always assume 'so' can only modify adjectives.

Hi,

Here filled with pungent oils is not a verb. It is a modifier which describes the leaves of wild onion.

Now coming to the question: B and C can be eliminated because of Subject verb agreement error.
D and E changes the meaning and have pronoun errors (them and it are not the correct usage).

Answer: A

Hi, What "they" refers to in option A.