(Bloomberg) -- Chinese stocks extended losses as mainland banks surprisingly kept a key interest rate tied to mortgages on hold, in a move that raised doubts over the country’s commitment to support the embattled property sector.Most Read from BloombergBorrowers With $39 Billion in Student Loans Finally See ReliefBond Bulls at JPMorgan, Allianz Keep Piling Into a Bet Gone BadPutin Turns to Ruble and Ballot to Shore Up Shaken AuthorityCargill Tests 123-Foot-Tall Sails in Effort to Slash Fuel Burn