________ the photos sent back by the satellite, they have come to the conclusion that there is no life on Venus．
A.Used byB.Compared withC.Based onD.Connected to在线课程C
考查非谓语动词。句译为：根据从卫星上发回的照片，他们得出金星上没有生命的结论。be based on“根据……”，其他选项不合句意。