Great advice! Anyone with pending I751 should go to the interview with their spouse. I had pending I751 and asked my husband to come with me for the interview even though they never mentioned any combo interview. Infact, I didn't say anything about the pending application, but the officer mentioned 'Oh! you have a pending application'. I said, 'yes'. He said, 'good thing your husband is here, so we know you're still married'. He didn't ask my husband any questions and I'm not sure what he would have decided if my husband wasn't there, I was just glad that he was. Better to be safe than sorry!