题目

— I called you yesterday afternoon. But you didn't answer me. —Yesterday afternoon? Oh, I ________ in Olympic Sports Center. A . am swimming B . swim C . was swimming D . will swim 答案：C-Has Nate Robinson ever won the Slam Dunk Contest？-Yes．He won it in 2006，2009 and 2010，____he is as short as 1.75 meters．A. as B. since C. however D. although