SHANGHAI (Reuters) - The yield spread between Chinese and U.S. sovereign bonds was quoted at its widest since March 3 on Wednesday, as U.S. yields fell following soft service sector data. The spread between the Chinese and U.S. sovereign 10-year yield was last quoted at 176 basis points, according to Refinitiv data. Reporting by Andrew Galbraith; Editing by Jacqueline Wong Our Standards: The Thomson Reuters Trust Principles.