This question type feel like Barron's... is it? I don't think GMAT ever tests such kind of questions; pronoun reference yes but pronoun usage, I don't think so.
Couldn't agree more.
It has been a long time now that I don't use the Barron's anymore. I just overflew it 2 days ago while I was on the phone and saw this SC. And I was wrong. Even if it not a question asked for the GMAT, pronoun is an important concept few people have mastered, and I even less.
And the other SC comes from the forum.
OA B and E.
1.I don't understand why because in the first, '..the thief was I', the subject is the thief, not I. We cannot just invert the sentence and say 'I was the thief'! Instead of I, it could be you :'the thief was you'. If 'you' were the subject, it would be 'the thief were you'.
2. 'it was we'. Don't know which rule here is valid. Why not 'it was us' since the subject is 'it' and not 'us'. And is it is 'who' which is the subject of the second part of the sentence.
So it remains totally unclear...