The euro sagged to a seven-month trough on Monday as the prospect of more policy easing in Europe benefited the U.S. dollar, while activity in Asian shares was crimped by a holiday in Japan. The strength of the dollar also combined with worries about Chinese demand to clobber commodity prices again, sending copper to its lowest in over six years. The head of the European Central Bank, Mario Draghi, last week offered the strongest hint yet that the ECB will unveil fresh stimulus measures at its Dec. 3 policy meeting.