The BSE Sensex on Thursday closed at its highest in nearly a month, gaining for a fifth session, with lenders such as State Bank of India rising after rating agency Moody’s revised India’s sovereign rating outlook. The Sensex gained 177.46 points, or 0.62 per cent, to 28,885.21 points, its highest closing level since March 12. The Nifty rose 63.90 points, or 0.73 per cent, to 8,778.30 points.