WRAPUP 3-S&P threatens to cut U.S. credit rating on deficit

WRAPUP 3-S&P threatens to cut U.S. credit rating on deficit
* S&P cites lack of plan to address fiscal challenges * S&P says one-in-three chance of rating cut in two years * Stocks fall but dollar holds firm, bonds recover (Adds comment, detail) NEW YORK, April …
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