The euro held at a four-month high against the U.S. dollar on Thursday, as optimism lingered around Germany's plan for a massive infrastructure fund and debt overhaul, ahead of the European Central Bank's policy announcement later in the day. The euro hit $1.0822 on Thursday for the first time since November 7. It was last little changed on the day. The shared currency has gained 4.1 per cent so far this week, set for its biggest weekly jump since March 2009. A quarter-point rate cut is widely