根据句意,用have/has been (to)或have/has gone (to)完成句子。
如图所示,a、b是两电阻R1和R2的I﹣U图象,它们把第一象限分成Ⅰ、Ⅱ、Ⅲ、三个区域,若将R1和R2并联,则并联后的总电阻的I﹣U图象( )
______of the boys has got a pen and some paper.