The speech by the mayor of Shanghai before the final voting for EXPO 2010 is strongly impressed ______ my memory.
A.toB.overC.byD.on在线课程D
句意为“上海市的市长为争取2010年世博会的演讲给我留下了极为深刻的印象”。所缺介词与impress组成短语，作“给……留下印象”讲，介词用on，为习惯表达。