The salesman scolded the girl caught _____ and let her off. [ ]

A. to have stolen

B. to be stealing

C. to steal

D. stealing

下列有关物质分类的说法正确的是

A．煤、石油和天然气都属于化石能源

B．纯碱、烧碱、碱式碳酸铜都属于碱类物质

C．O₂和O₃、H₂和D₂、HO和HO都互为同素异形体

D．CH₂Cl₂、CH₄O、C₂H₄O₂一定是纯净物