well you have to look at the differences between whom and who.
If you can restate the sentence in your head and say HIM ..that sentence can hold a WHOM.. Because both terms (him and whom) are possesive.
then you have HE and that is paired with WHO. Again, if you can substitute he into the sentence when referencing t the person you can use who. non possessive ..
so you now have he who in you sentence.. and you wouldn't be able to say he whom..
SC - Barron's questions
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Source: Beat The GMAT — Sentence Correction |

















