SE Asia Stocks-Singapore posts biggest gain in three weeks

JAKARTA, Dec 7 (Reuters) - Southeast Asian stock markets closed mostly higher on Monday despite caution in the wider Asian market ahead of the release of key Chinese data on Tuesday and Wednesday, with the Singapore index posting its biggest gain in nearly three weeks on higher bank shares. Singapore's FTSE Straits Times Index closed 0.8 percent higher, its best single-day percentage gain since Nov. 19, boosted by big banks. Shares of DBS Group Holdings Ltd rose 0.8 percent, while Oversea-C